[1.6.x] Curios, Stimms, Difficulty Mutators, Player Debuffs & Mechanics

This guide explains mechanics related to Curio stats, stimms, (select) difficulty mutators, and player debuffs.

For details on talents and their mechanics:

• Psyker's talents
  
• Ogryn's talents
  
• Veteran's talents
  
• Zealot's talents

For details on weapon blessings and their mechanics:

• Melee weapon blessings
  
• Ranged weapon blessings

Curio Blessings

Icon	Mechanics
	Health +X% Max Health stat buff: max_health_modifier Highest possible value per curio: 21% Increases a character's maximum health; also applies to health while downed. Stacks additively with max health buffs from other curio blessings, curio perks and small talent nodes. For example, one +21% health curio, one +17% health curio, and a 10% health small talent node increase a Zealot's base max health of 200 by 200x(0.21+0.17+0.1)=96 to 296 health total.
	Toughness +X% Toughness stat buff: toughness_bonus Highest possible value per curio: 17% Increases a character's maximum toughness; stacks additively with other toughness percentage buffs from curio blessings and curio perks, their sum stacks multiplicatively with a character's base toughness amount and flat toughness increases. For example, a Veteran with one +15 toughness small talent node, one +16% toughness curio, and one +14% toughness curio will have his base toughness amount of 100+15=115 further increased by 115x(0.16+0.14)=34.5 to 149.5 toughness total (HUD rounds up: 150). A character's maximum toughness is the base value that is used in toughness replenished calculations of most talents and blessings.
	Stamina +X Max Stamina stat buff: stamina_modifier Highest possible value per curio: +3 Increases a character's maximum stamina; stacks additively with other stamina curios, stamina weapon perks, stamina small talent nodes, and weapon stamina templates. Each segment of the stamina bar in the player HUD represents 1 stamina. Note that some stamina curios with a 400 rating, despite occasionally displaying +3 in the inventory menu, will in fact only add +2 stamina when connected to game servers. This is due to how the lerped values are being displayed.
	Wound +X Wound(s) stat buff: extra_max_amount_of_wounds Highest possible value per curio: +1 Adds one health segment; stacks additively with other wound curios and Zealot's talent Faith's Fortitude . After getting knocked down, one health segment is fully converted to corruption damage; if a character has only one uncorrupted health segment remaining the next knockdown will kill the character. Base amount of health segments: Psyker, Veteran Zealot 4 3 2 Ogryn 5 4 3

Curio Perks (Part I)

Health

+X% Max Health stat buff: max_health_modifier Increases a character's maximum health; also applies to health while downed. Stacks additively with max health buffs from other curios perks, curio blessings and small talent nodes. For example, one +20% health curio with a +4% health perk, one +18% health curio with a +5% health perk, and a 10% health small talent node increase Zealot's base max health of 200 by 200x(0.2+0.04+0.18+0.05+0.1)=114 to 314 health total.

Values (per tier) 2% | 3% | 4% | 5%

Toughness

+X% Toughness stat buff: toughness_bonus Increases a character's maximum toughness; stacks additively with other toughness percentage buffs from curio perks and curio blessings, their sum stacks multiplicatively with a character's base toughness amount and flat toughness increases. For example, an Ogryn with two +15 toughness small talent nodes, one +15% toughness curio with a +4% toughness perk, and one +17% toughness curio with a +5% toughness perk will have his base toughness amount of 50+15+15=80 further increased by 80x(0.15+0.04+0.17+0.05)=32.8 to 112.8 toughness total (HUD rounds up: 113).

Values (per tier) 2% | 3% | 4% | 5%

Toughness Regeneration Speed

+X% Toughness Regeneration Speed stat buffs: toughness_regen_rate_modifier toughness_regen_delay_multiplier This curio perk does two things: (1) It increases a character's base amount of toughness regenerated while in coherency; stacks additively with the same buff from other curios, and talents like Ogryn's Feel No Pain , Lynchpin , Stay Close! , or Veteran's small talent node Inspiring Presence ; stacks multiplicatively during calculation with Zealot's Fortitude in Fellowship and Loner . 0 0 0 0 14.25 1 3.75 7.125 9 14.25 2 5.625 10.6875 13.5 17.8125 3 7.5 14.25 18 21.375 (2) It reduces the coherency regeneration delay. This is the time until coherency regen kicks in after its conditions have been met; stacks multiplicatively with the same buff from other curios. Base Delay 1x Tier 4 perk 2x Tier 4 perk 3x Tier 4 perk Regen Delay 1.5s 1.2s 0.96s 0.768s For further details on coherency toughness, see the 'Base Stats' section in any of the talent guides .

Buff Regen Rate Regen Delay

Values (per tier) +7.5% | +15% | +22.5% | +30% -5% | -10% | -15% | -20%

Combat Ability Regeneration

+X% Combat Ability Regeneration stat buff: ability_cooldown_modifier Reduces the maximum cooldown of combat abilities; stacks additively with max cooldown reductions (from other curios, Psyker's aura Seer's Presence , and the difficulty mutators that reduce ability cooldowns by 20%) as well as with max cooldown increases (from Veteran's Only in Death Does Duty End , Overwatch , or Zealot's Perfectionist ). For example, a Veteran with Overwatch (+0.33) playing the Maelstrom mutator (-0.2) with three 4% curio perks (-0.12) while being in coherency with a Psyker running the cooldown aura (-0.1), now has an Infiltrate max cooldown of 45+45x(0.33-0.42)=40.95s (HUD rounds up: 41s). Does not interact with Concentration Stimm's remaining cooldown reduction effect which increases a character's base ability cooldown rate of 1s per second by additional 3s per second. For an explanation of how this curio perk interacts with Psyker's Warp Siphon , see the Psyker talent guide .

Max Cooldown Reduction (per tier) 1% | 2% | 3% | 4%

Curio Perks (Part II)

Block Efficiency

+X% Block Efficiency stat buff: block_cost_multiplier Reduces the stamina cost when blocking attacks; stacks multiplicatively with block cost reduction buffs from other curios and melee weapon perks, Psyker's Kinetic Deflection , weapon blessings Deflector , Last Guard , and with stamina cost reduction buffs from Veteran's Conditioning , and Celerity Stimm . For example, blocking a Crusher sideswing with the Chainsword Mk IV: With just the Chainsword equipped, a Veteran has 6 max stamina. The Crusher sideswing deals 4 stamina damage. With three Tier 4 curio perks, and a 20% Block Efficiency perk on the weapon, the sideswing's stamina damage is reduced to 4x0.88³x0.8=2.18 (the HUD will display 64% remaining stamina). For an in-depth explanation of how this curio perk interacts with Kinetic Deflection , see the Psyker talent guide .

Block Clost Reduction (per tier) 6% | 8% | 10% | 12%

Revive Speed

+X% Revive Speed (Ally) stat buff: revive_speed_modifier Increases a character's interaction speed when reviving knocked down allies; stacks additively with revive speed buffs from other curios and talents like Veteran's Leave No One Behind (LNOB). Only applies to revive actions, does not apply when rescuing respawned allies, pulling allies up from ledges, or freeing allies from nets. Base 12% Revive Speed 24% Revive Speed 36% Revive Speed 36% Revive Speed w/ LNOB Revive Time 3s ~2.68s ~2.42s ~2.2s ~1.92s

Revive Speed (per tier) 6% | 8% | 10% | 12%

Sprint Efficiency

+X% Sprint Efficiency stat buff: sprinting_cost_multiplier Reduces stamina drain while sprinting; stacks multiplicatively with sprinting cost reduction buffs from other curios, ranged and melee weapon perks, talents like Zealot's Unremitting , and Celerity Stimm ; also stacks multiplicatively with stamina cost reduction buffs from Veteran's Conditioning and Celerity Stimm. For example, Zealot with a Tactical Axe equipped has 4 max stamina. All Tactical Axes have a base drain rate of 0.75 stamina per second while sprinting. So without any buffs, Zealot can sprint for 4/0.75=5.33s until stamina reaches 0. With three Tier 4 curio perks, Zealot can now sprint for 4/(0.75x0.85³)=8.68s. Alternatively, with just an active Celerity Stimm (i.e. a sprinting_cost_multiplier of 0.5, and a stamina_cost_multiplier of 0.75), Zealot can now sprint for 4/(0.75x0.5x0.75)=14.22s.

Sprint Cost Reduction (per tier) 6% | 9% | 12% | 15%

Stamina Regeneration

+X% Stamina Regeneration stat buff: stamina_regeneration_modifier Increases a character's stamina regeneration rate; stacks additively with the same buff from other curios. For example, Ogryn has a stamina regeneration rate of 1 stamina per second. With three Tier 4 curio perks, this is increased to 1+0.36=1.36 stamina per second. So if Ogryn has 8 max stamina, he now would regen from 0 to full in 8/1.36=5.88s. Note that this curio perk does not affect the stamina regeneration delay. This delay is set per character (for details on each character's stamina stats, see the 'Base Stats' section in the respective talent guides ) and can only be reduced by Veteran's two small stamina regen delay talent nodes.

Stamina Regen (per tier) 6% | 8% | 10% | 12%

Curio Perks (Part III)

Corruption Resistance

+X% Corruption Resistance stat buff: corruption_taken_multiplier Reduces corruption damage taken by any enemy source that is dealing corruption damage, including Poxburster explosion, toxic gas, Poxwalker melee attacks, Pox Hound pounce, Beast of Nurgle vomit/slime/consumed, Daemonhost, grimoires, etc; stacks multiplicatively with the same buff from other curios and other damage reduction buffs. Against Dreg Tox Bomber and Pox Hound, this curio perk can be stacked with Bomber Resistance and Pox Hound Resistance respectively to further reduce the damage taken by these two breeds. For example: Nominal Reduction 2x15% 3x15% 2x15% 1x20% 1x15% 2x20% 3x20% 2x15% 2x20% 3x15% 3x20% Effective Reduction 27.75% ~38.59% 42.2% 45.6% 48.8% 53.76% 68.55%

Damage Resistance (per tier) 6% | 9% | 12% | 15%

Grimoire Corruption Resistance

+X% Corruption Resistance (Grimoires) stat buff: corruption_taken_grimoire_multiplier Reduces corruption damage taken by grimoires reducing both the fixed grimoire_chunk of 40 corruption damage per book as well as the corruption DoT (1.2 base corruption damage every 10s); stacks multiplicatively with the same buff from other curios, Corruption Resistance , and other health damage reduction buffs. For example: Nominal Reduction 2x20% 3x15% 2x15% 1x20% 1x15% 2x20% 3x20% 2x15% 2x20% 3x15% 3x20% Effective Reduction 36% ~38.59% 42.2% 45.6% 48.8% 53.76% 68.55%

Damage Resistance (per tier) 5% | 10% | 15% | 20%

Bomber Resistance

+X% Damage Resistance (Bombers) stat buffs: damage_taken_by_cultist_grenadier_multiplier damage_taken_by_renegade_grenadier_multiplier Reduces any damage taken by Dreg Tox Bomber and Scab Bomber attacks: direct grenade hit, grenade toxic gas cloud, grenade ground fire patch, melee kick; stacks multiplicatively with the same buff from other curios and other damage reduction buffs. Against Dreg Tox Bomber, this curio perk can be stacked with Corruption Resistance to further reduce the corruption damage taken by grenade's toxic gas. For example: Nominal Reduction 2x15% 3x15% 2x15% 1x20% 1x15% 2x20% 3x20% 2x15% 2x20% 3x15% 3x20% Effective Reduction 27.75% ~38.59% 42.2% 45.6% 48.8% 53.76% 68.55%

Breeds Dreg Tox Bomber Scab Bomber

Damage Resistance (per tier) 5% | 10% | 15% | 20% 5% | 10% | 15% | 20%

Flamer Resistance

+X% Damage Resistance (Tox Flamers) stat buffs: damage_taken_by_cultist_flamer_multiplier damage_taken_by_renegade_flamer_multiplier Reduces damage taken by Dreg Tox Flamer and Scab Flamer attacks: direct fire hit, fire DoT, flamethrower trail on ground, and melee kick; stacks multiplicatively with the same buff from other curios and other damage reduction buffs. Note that this curio perk does reduce the initial explosion damage of the exploding tank but does not reduce damage taken by the ground fire patch that is left behind by the tank explosion of either Flamer breed. For example: Nominal Reduction 2x10% 2x15% 2x20% 3x15% 2x15% 1x20% 1x15% 2x20% 3x20% Effective Reduction 19% 27.75% 36% ~38.59% 42.2% 45.6% 48.8%

Breeds Dreg Tox Flamer Scab Flamer

Damage Resistance (per tier) 5% | 10% | 15% | 20% 5% | 10% | 15% | 20%

Curio Perks (Part IV)

Gunner Resistance

+X% Damage Resistance (Gunners) stat buffs: damage_taken_by_cultist_gunner_multiplier damage_taken_by_renegade_gunner_multiplier damage_taken_by_chaos_ogryn_gunner_multiplier Reduces any damage taken by Dreg Gunner, Scab Gunner, and Reaper (ranged and melee attacks); stacks multiplicatively with the same buff from other curios and other damage reduction buffs. Against Reaper, this curio perk can be stacked with Ogryn's Heavyweight talent to further reduce damage taken by Reaper's attacks specifically. For example: Nominal Reduction 2x10% 2x15% 2x20% 3x15% 2x15% 1x20% 1x15% 2x20% 3x20% Effective Reduction 19% 27.75% 36% ~38.59% 42.2% 45.6% 48.8%

Breeds Dreg Gunner Scab Gunner Reaper

Damage Resistance (per tier) 5% | 10% | 15% | 20% 5% | 10% | 15% | 20% 5% | 10% | 15% | 20%

Mutant Resistance

+X% Damage Resistance (Mutants) stat buff: damage_taken_by_cultist_mutant_multiplier Reduces any damage taken by Mutant (slams); stacks multiplicatively with the same buff from other curios and other damage reduction buffs. Note that this curio perk does not reduce damage taken by the Mutant breed variant (with glowing eyes) that is spawned by difficulty mutators ('Waves of Mutants'). For example: Nominal Reduction 2x10% 2x15% 2x20% 3x15% 2x15% 1x20% 1x15% 2x20% 3x20% Effective Reduction 19% 27.75% 36% ~38.59% 42.2% 45.6% 48.8%

Damage Resistance (per tier) 5% | 10% | 15% | 20%

Pox Hound Resistance

+X% Damage Resistance (Pox Hounds) stat buff: damage_taken_by_chaos_hound_multiplier Reduces any damage taken by Pox Hound (pounced); stacks multiplicatively with the same buff from other curios, Corruption Resistance , and other damage reduction buffs. Note that this curio perk does not reduce damage taken by the Pox Hound breed variant (with glowing eyes) that is spawned by difficulty mutators ('Hunting Grounds'). For example: Nominal Reduction 2x10% 2x15% 2x20% 3x15% 2x15% 1x20% 1x15% 2x20% 3x20% Effective Reduction 19% 27.75% 36% ~38.59% 42.2% 45.6% 48.8%

Damage Resistance (per tier) 5% | 10% | 15% | 20%

Sniper Resistance

	+X% Damage Resistance (Snipers) stat buff: damage_taken_by_renegade_sniper_multiplier Reduces any damage taken by Sniper (shot, melee attacks); stacks multiplicatively with the same buff from other curios and other damage reduction buffs. For example: Nominal Reduction 2x10% 2x15% 2x20% 3x15% 2x15% 1x20% 1x15% 2x20% 3x20% Effective Reduction 19% 27.75% 36% ~38.59% 42.2% 45.6% 48.8%
	Damage Resistance (per tier) 5% | 10% | 15% | 20%

Curio Perks (Part V)

Curio Drop Chance

+X% chance of Curio as Mission Reward (instead of Weapon) meta stat buff: mission_reward_gear_instead_of_weapon_modifier Increases the chance to receive a curio instead of a weapon reward when completing a mission; stacks additively with the same buff from other curios. Relevant data is handled by Fatshark's backend, so exact statements on base curio drop rate and the impact of this buff cannot be made.

Values (per tier) 5% | 10% | 15% | 20%

Experience

+X% Experience meta stat buff: mission_reward_xp_modifier Increases the amount of XP a character gains from failed or completed missions; stacks additively with the same buff from other curios. Also applies to XP gains beyond level 30 (overlevels can be displayed by the True Level [www.nexusmods.com] mod). Generally, progression data is stored and handled by Fatshark's backend, so exact statements cannot be made. But it looks like that this buff applies to the XP total which would include bonuses from quickplay, side objectives and difficulty mutators. This curio perk does not affect weapon mastery XP.

Values (per tier) 2% | 4% | 6% | 10%

Ordo Dockets

+X% Ordo Dockets (Mission Rewards) meta stat buff: mission_reward_credit_modifier Increases the amount of Ordo Dockets gained from failed or completed missions; stacks additively with the same buff from other curios. Generally, progression data is stored and handled by Fatshark's backend, so exact statements cannot be made. But it looks like that this buff applies to the Ordo Dockets total which would include bonuses from quickplay, side objectives and difficulty mutators.

Values (per tier) 4% | 6% | 8% | 10%

Stimms

Celerity Stimm

Icon

Mechanics

Duration: 15s; can be refreshed during active duration Sets a character's stamina to 100% upon use. Additionally, grants the following buffs: stat buffs: attack_speed charge_up_time fov_multiplier reload_speed sprinting_cost_multiplier stamina_cost_multiplier • Increases ranged and melee weapon attack animation speed by 20%; stacks additively with other attack speed buffs from talents • Reduces the charge up time of weapon charging actions (e.g. Plasma Gun, Helbore Lasguns, Psyker staves alt fire) and ability charging actions (Psyker's Brain Rupture / Brain Burst , Smite ) by 25%; stacks additively with weapon blessings Volatile , Warp Flurry , and Weight of Fire • Slightly zooms out FOV • Increases weapon reload animation speed by 15%; stacks additively with other reload speed buffs from talents, weapon blessings, and weapon perks • Reduces stamina drain while sprinting by 50%; stacks multiplicatively with sprinting cost reduction buffs from Sprint Efficiency on curios, ranged and melee weapons, and talents like Zealot's Unremitting ; also stacks multiplicatively with stamina cost reduction buffs from Veteran's Conditioning and Celerity Stimm • Reduces any kind of stamina drain by 25% (blocking, pushing, sprinting, Veteran's Deadshot ); stacks multiplicatively with the same buff from Veteran's Conditioning ; also stacks multiplicatively with sprinting cost reduction buffs from Sprint Efficiency on curios, ranged and melee weapons, talents like Zealot's Unremitting , and Celerity Stimm ; also stacks multiplicatively with block cost reduction buffs from Block Efficiency on curios and melee weapons, Psyker's Kinetic Deflection , and weapon blessings like Deflector and Last Guard stat buffs: (Psyker only) chain_lightning_jump_time_multiplier psyker_throwing_knife_speed_modifier smite_attack_speed vent_warp_charge_multiplier • Reduces Smite's jump time by 25%, from 0.3s to 0.24s, for both LMB and RMB; stacks multiplicatively with related buff from Empowered Psionics • Increases the speed of Assail's shard throwing actions by 25% for both LMB and RMB • Reduces Brain Rupture / Brain Burst's charge time by 25% for both LMB and RMB attacks; stacks additively with charge time reductions from Empowered Psionics and Kinetic Resonance , and multiplicatively with Celerity Stimm's general charge time reduction • Increases the overall efficiency of quelling by 25%; stacks multiplicatively during calculation with talent Solidity that modifies the speed at which peril is quelled; applies only to active quelling, passive quelling is unaffected

Combat Stimm

Icon

Mechanics

Duration: 15s; can be refreshed during active duration stat buffs: fov_multiplier power_level_modifier rending_multiplier • Slightly zooms in FOV • Increases the power level of melee and ranged attacks, explosions, DoTs, and Blitz and Combat abilities by 25%; stacks additively with other power level buffs from weapon blessings, and multiplicatively with damage buffs; 'Power level buffs' increase the base power of attacks which benefits damage, stagger, and cleave (where applicable) • Grants 25% rending to melee and ranged attacks, explosions, DoTs, and damaging Blitz and Combat abilities boosting damage against armor types Carapace, Flak, Maniac, Unyielding; stacks additively with other rending buffs ('rending') and with rending debuffs that are applied to enemies ('brittleness') stat buff: (Psyker only) warp_charge_amount • Reduces the amount of peril generated by 33%; stacks multiplicatively with other peril cost reduction buffs from Becalming Eruption , By Crack of Bone , Empyric Resolve , Inner Tranquility , Kinetic Resonance , Reality Anchor , and small Peril Resistance nodes

Concentration Stimm

Icon

Mechanics

Duration: 15s; can be refreshed during active duration function: reduce_ability_cooldown_time Additionally to a character's base combat ability cooldown rate of 1s per second, reduces the remaining ability cooldown by 3s per second. For example, with an active Concentration Stimm, a 45s cooldown will be finished after 45/4=11.25s. Other reduction effects that reduce the remaining ability cooldown proc additionally to the stimm's effect, e.g. Psyker's Psykinetic's Aura , or Ogryn's Bruiser , Go Again! , Maximum Firepower , or Veteran's Tactical Awareness , or Zealot's Invocation of Death , Martyr's Purpose , Pious Cut-Throat . Does not interact with Combat Ability Regeneration from curios which only reduces the maximum cooldown of a combat ability.

Med Stimm

Icon

Mechanics

Duration: 8s; can be refreshed during active duration Upon use, restores either one health segment worth of health or 25% of a character's maximum health depending on which amount to be healed is greater. Restores both missing health and permanent corruption damage. Cannot be used if the target (self or ally) is at 100% max health; cannot be used on knocked down allies. The buff icon shows the 8s duration. During this duration, the total to-be-restored health amount can be restored at any time. For example, for a character with 210 max health and 2 health segments the total amount to be healed will be 210/2=105 health (because 210x0.25=52.5 would be smaller). If this character uses the stimm at 167 health, the missing amount of 210-167=43 health will be restored upon use. This means that the stimm can still restore 105-43=62 health during the remainder of its active duration. So if the character takes 80 more damage before the duration ends, the stimm will restore 62 health and leave the character at 210-80+62=192 health.

Maelstrom Mutators (Part I)

Combat Ability Cooldown

Icon       

Mechanics

Players have 20% reduced Ability cooldown.

stat buff: ability_cooldown_modifier

Reduces the maximum cooldown of combat abilities; stacks additively with max cooldown reductions (Combat Ability Regeneration from curios, and Psyker's aura Seer's Presence) as well as with max cooldown increases (from Veteran's Only in Death Does Duty End, Overwatch; or Zealot's Perfectionist).

For example, a Zealot with Perfectionist (+0.25) playing the mutator (-0.2) with two 4% curio perks (-0.08) while being in coherency with a Psyker running the cooldown aura (-0.1), now has a Shroudfield max cooldown of 30+30x(0.25-0.38)=26.1s.

Does not interact with Concentration Stimm's remaining cooldown reduction effect which increases a character's base ability cooldown rate of 1s per second by additional 3s per second.

For an explanation of how this mutator's cooldown reduction interacts with Psyker's Warp Siphon, see the Psyker talent guide.

Enhanced Blitz

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Mechanics

Enhanced Blitz.

stat buffs:
extra_max_amount_of_grenades
warp_charge_amount_smite

For Ogryn, Veteran, and Zealot, this mutator adds 2 grenades to the maximum grenade capacity; stacks additively with Veteran's Grenadier, so for example, playing the mutator with the talent, Veteran can now carry 3+2+1=6 Frag Grenades total.

For Ogryn, also adds 2 rocks to Big Friendly Rock's maximum projectile capacity (now 6 total).

For Zealot, also adds 2 throwing knives to Blades of Faith's maximum projectile capacity (now 14 total).

For Psyker, adds 2 shards to Assail's maximum projectile capacity (now 12 total), and reduces peril cost for Brain Rupture / Brain Burst and Assail by 50%; the peril cost reduction stacks multiplicatively with Kinetic Resonance. For Smite, this mutator does nothing.

Monstrous Specialists

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Mechanics

Monstrous Specialists (Chance that Specialists become weaker Monstrosities).

This mutator grants a 20% chance to spawn a monster instead of a special. Possible monster breeds are Beast of Nurgle, Chaos Spawn, and Plague Ogryn. Monstrosities spawned by the mutator have 60% reduced max health (see table). The maximum amount of monstrosities that can be alive at the same time and are spawned by the mutator is 2. Note that this max amount does not consider monstrosities that are spawned naturally by map triggers (these have full health) and that it can struggle to apply when special pacing has just (re)started (e.g. at the beginning of a map or after a map event that disabled special pacing).

Beast of Nurgle

Chaos Spawn

Plague Ogryn

Health
(Damnation)

21000

18900

24000

Nurgle's Blessing

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Mechanics

Nurgle's Blessing (Enemies have a chance to get a buff that makes them tougher).

This mutator grants a chance that enemies receive a set of buffs when they spawn:

2.5%	Groaner
5%	Bruisers, Scab Shooter, Stalkers
7.5%	Poxwalker
10%	Bulwark, Crusher, Gunners, Pox Hound (mutator), Mauler, Mutant (mutator), Reaper, Scab Bomber, Scab Captain
12%	Mutant
15%	Dreg Tox Bomber, Flamers, Pox Hound, Ragers, Shotgunners, Sniper, Trapper
25%	Beast of Nurgle, Chaos Spawn, Daemonhost, Plague Ogryn

* Enemy breeds that are not listed cannot be affected by this mutator.

Enemies affected by Nurgle's Blessing receive the following buffs:

• adds green VFX to enemies' bodies
• reduces incoming damage by 35%
• grants an impact_modifier of -100% which makes enemies harder to stagger; talents like Ogryn's Crunch!, Slam, or Veteran's Competitive Urge and Executioner's Stance, or Zealot's Grievous Wounds, Hammer of Faith, Punishment, The Emperor's Bullet, and weapon blessings like Hammerblow, Thunderstrike, Trauma, etc, that buff an attack's stagger strength can help mitigate this effect
• increases enemy movement speed by 25%; does not apply to Scab Captain and monstrosities; Mutants are the only specials that have their movement speed increased
• increases ranged attack animation speed by 20%; applies to Gunners, Reaper, Scab Shooter, Shotgunners, Stalkers, and Scab Captain
• doubles the number of shots fired per shooting action for Gunners, Reaper, Scab Shooter, Stalkers, and Scab Captain; for example, a Scab Shooter fires either 2 or 3 shots per action but when buffed now fires either 4 or 6 shots per action; or a Dreg Gunner who normally fires 40 shots now fires 80 shots when buffed

Maelstrom Mutators (Part II)

Power Supply Interruption / Ventilation Purge

Icons       

Mechanics

The lights are out, bring a torch.

Visibility reduced. Keep your melee weapons close.

These mutators provide two noteworthy changes that affect gameplay mechanics, both are related to enemy perception:

(1) The lights are out (Power Supply Interruption) or there is fog on the map (Ventilation Purge) and each reduces visibility for players, but also for enemies. All enemies (except for specials, monstrosities, and Captains/Twins) have their detection radius decreased by 50% (Power Supply Interruption) or by 30% (Ventilation Purge). This is the radius in which enemies try to detect possible player targets.

For example, Shotgunners (like most enemies) have a detection radius of 15m while unaggroed which the mutators reduce to 7.5m and 10.5m respectively, so players can approach enemies further before being detected and aggroing enemies by proximity.

(2) Enemies can be aggroed from a distance if a weapon flashlight is pointed directly at them. This effect exceeds most enemies' natural aggro ranges, especially considering that both mutators reduce enemy perception. The distances depend on the weapons' flashlight templates:

Lasguns (Infantry, Recon)	28m	21m
Autoguns (Infantry)	18m	13.5m
Autopistol	18m	13.5m
Heavy Stubbers	14m	10.5m

Note that a Daemonhost, without these two difficulty mutators, can always be alerted and ultimately aggroed by any flashlight that is pointed directly at it from within a 22m distance. The rate at which it builds up anger and therefore the time it requires to progress through its anger stages depends on distance: 3s within 7.5m to 12m, 23s within 20m, 33s within 22m (this is accounting for uninterrupted flashlight exposure and no other additional aggro factors); time starts when the greenish light appears.

Moreover, Power Supply Interruption has a higher chance to fill active monster triggers with Daemonhosts and also enables Poxwalker encampments (up to 6 per map) which are ambient hordes that remain passive until aggroed by players.

Pox Gas (Enemy Buff)

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Mechanics

Higher concentrations of Moebian Pox Zetaphyte-13 have been identified in this area. Don't breathe too deeply.

For details on the debuffs players receive from toxic gas see the respective 'Player Debuffs' section below.

There are currently three sources of toxic gas: Dreg Tox Bomber grenades, the 'Pox Gas' mutator, and the gas clouds from Karnak Twins ambushes and boss fight. All sources apply the same buffs to enemies (see below). Enemies who are in toxic gas receive applicable buffs and keep them for 6s after leaving toxic gas. Buffs are applied to all enemies including Captains, Twins (if they are in Dreg Tox Bomber gas cloud), and monstrosities; toxic gas spawned in relation to Karnak Twins events (ambushes, boss fight) only affects Poxwalkers and no other enemies.

• adds green VFX to enemies' eyes (Beast of Nurgle and Chaos Spawn don't play the VFX but receive applicable buffs regardless)
• reduces incoming damage by 20%
• increases enemy movement speed by 30%; does not apply to Captains/Twins and monstrosities; Mutants are the only specials that have their movement speed increased
• increases enemy hit mass by 150% which makes enemies harder to cleave; weapon blessings like Devastating Strike, Perfect Strike, Savage Sweep, Shock & Awe, Sunder, and Wrath that buff an attack's effective hit mass limit can mitigate this effect

Karnak Twins Hard Mode

Hard Mode can only be enabled on Damnation difficulty by ringing the bell. The puzzle to unlock Hard Mode can be completed on any difficulty. This section only lists changes that are active with Hard Mode enabled, for a general overview of the fight and some further details refer to this guide.

Empowered Bosses

• adds red VFX to their heads
• increases both melee and ranged attack animation speed by 50%
• grants them an impact_modifier of -300% which makes them effectively impossible to stagger with regular attacks; can still be staggered by combat abilities that force stagger (Ogryn's Loyal Protector, Veteran's Voice of Command, Zealot's Holy Relic with Banishing Light)
• increases their hit mass to 12 (from 4) which makes them harder to cleave
• doubles the void shield regeneration to 1600/s (up from 800/s) when one twin's shield is broken; having 12000 max shield, this would let a twin regen from 0 to full in 7.5s
• reduces incoming damage:

Rinda	-50% damage (head, right upper arm)	-50% damage (torso, right lower arm)	-30% damage (center mass, left arm, legs)
Rodin	-50% damage (head, left upper arm)	-50% damage (torso, left lower arm)	-30% damage (center mass, right arm, legs)

Boss Behavior Changes

Rinda
• random dash: can use a dash randomly
• dash considerations: is overall more likely to use her 'dash and sweep' attack

Rodin
• grenade throw considerations: is overall more likely to throw multiple grenades at once instead of single grenades; lower grenade throw cooldown (4s, down from 8s); can throw grenades if he hasn't done so within the last 8s (down from 20s); can throw grenades at players at up to 20m distance (increased from 15m)

Combat Pacing Changes

• enables additional enemy spawn waves every 20s to 28s throughout the fight; four different wave types with one predominant elite breed (Scab Shotgunners, Scab Ragers, Maulers, Crushers); randomly chosen
• alternating gas phase alarm: lowers the alarm duration to 2.5s (down from 4s); this is the time before the alternating safe zones (brightly illuminated) are about to change during gas phases; during this time the red alarm lights go off in the arena and alarm sounds are being played
• alternating gas phase: lowers the duration intervals of the alternating safe zones during the gas phases to 14s to 18s (down from 20s to 25s for the first gas phase, and down from 15s to 22s for subsequent gas phases)

Havoc Mode

Base Difficulty

The base difficulty changes with increasing Havoc ranks:

Malice

Heresy

Damnation

Havoc Ranks

1 to 10

11 to 20

21 to 40

Mutators & Modifiers

Additionally to the basic difficulty mutators, there are hidden difficulty modifiers that are enabled in a specific order. The table below shows the order in which these hidden modifiers get enabled. Higher tier modifiers, when they get enabled, replace existing lower tier ones. Havoc Rank 40 missions have all hidden modifiers enabled on their respective highest tiers.

1	Reduced Player Health 1	21	Reduced Ammo Pickup Amount 3 Reduced Quelling Speed 3 Reduced Player Health 3
2	Reduced Player Toughness 1 Reduced Coherency Toughness Regen 1	22	Increased Enemy Melee Attack Speed 3 Enemy Melee Corruption 3 Enemy Ranged Attacks Buff 3
3	Reduced Ammo Pickup Amount 1 Reduced Quelling Speed 1	23	Increased Elite Health 3 Monster Buff 3 Reduced Player Health 4
4	Increased Terror Event Spawn Rate 1	24	Reduced Ammo Pickup Amount 4 Reduced Quelling Speed 4 Increased Max Specials 3 Reduced Player Toughness 4
5	Increased Elite Health 1 Increased Special Health 1 Increased Max Specials 1	25	Horde Buff 4 Increased Special Health 3 Increased Horde Spawn Rate 4 Enemy Melee Corruption 4 Reduced Coherency Toughness Regen 4
6	Monster Buff 1	26	Increased Special Health 4 Increased Max Specials 4 Reduced Player Health 5 Increased Terror Event Spawn Rate 4
7	Horde Buff 1	27	Monster Buff 4 Increased Enemy Melee Attack Speed 4 Enemy Ranged Attacks Buff 4
8	Increased Enemy Melee Attack Speed 1 Enemy Ranged Attacks Buff 1	28	Increased Enemy Melee Power 4 Increased Ogryn Roamer Spawns 4
9	Enemy Melee Corruption 1 Increased Enemy Melee Power 1	29	Increased Elite Health 4 Increased Elite Roamer Spawns 4
10	Increased Horde Spawn Rate 1 Increased Elite Roamer Spawns 1 Increased Ogryn Roamer Spawns 1	30	'The Emperor's Fading Light' 2 Reduced Ammo Pickup Amount 5 Reduced Quelling Speed 5 Increased Horde Spawn Rate 5
11	Reduced Player Health 2	31	Increased Elite Roamer Spawns 5 Increased Ogryn Roamer Spawns 5
12	Reduced Player Toughness 2	32	Increased Enemy Melee Attack Speed 5 Increased Enemy Melee Power 5 Enemy Ranged Attacks Buff 5
13	Reduced Coherency Toughness Regen 2	33	Enemy Melee Corruption 5 Reduced Player Toughness 5
14	Reduced Ammo Pickup Amount 2 Reduced Quelling Speed 2 Increased Enemy Melee Power 2	34	Reduced Coherency Toughness Regen 5 Increased Terror Event Spawn Rate 5
15	Increased Horde Spawn Rate 2 Increased Max Specials 2 Increased Terror Event Spawn Rate 2	35	Horde Buff 5 Increased Horde Spawn Rate 6
16	'The Emperor's Fading Light' 1 Monster Buff 2 Increased Enemy Melee Power 3 Reduced Coherency Toughness Regen 3	36	Increased Max Specials 5
17	Horde Buff 2 Increased Enemy Melee Attack Speed 2 Enemy Ranged Attacks Buff 2	37	Monster Buff 5
18	Increased Elite Health 2 Enemy Melee Corruption 2	38	Increased Special Health 5
19	Increased Special Health 2 Reduced Player Toughness 3 Increased Terror Event Spawn Rate 3	39	Increased Elite Health 5
20	Horde Buff 3 Increased Horde Spawn Rate 3 Increased Elite Roamer Spawns 3 Increased Ogryn Roamer Spawns 3	40	Increased Horde Spawn Rate 7

Pickups

Plasteel and Diamantine pickups are disabled in Havoc missions. On average, the weight distribution of small and big ammo pickups is slightly reduced in Havoc missions; the pickup distribution of grenades, stimms, and deployables (ammo crate, med crate) is unchanged.

Havoc Mutators (Part I)

Cranial Corruption

Icon       

Mechanics

Reports indicate a sizeable number of enemies in this sector are infected with a head parasite.

This mutator grants a chance that enemies receive a set of changes when they spawn:

5%	Armored Groaner, Mauler, Scab Flamer
10%	Groaner, Poxwalker, Poxwalker (lesser mutated), Poxwalker (mutated), Bruisers, Stalkers, Scab Shooter, Dreg Rager, Gunners, Shotgunners, Bombers, Dreg Flamer
20%	Bulwark, Crusher, Reaper
25%	Scab Rager

* Enemy breeds that are not listed cannot be affected by this mutator.

Enemies affected by 'Cranial Corruption' receive the following changes:

• adds a different head model which has a green outline; this head hit zone has the Infested armor type; hitting the head with a ranged attack makes the enemy explode if the attack leaves the enemy at or with less than 30% max health, melee attacks cannot trigger the explosion; the explosion has a max radius of 6m, does not ignore toughness, deals 7.5 base damage to players (if no toughness, 50% of this amount is dealt as corruption damage), and deals average damage and decent stagger against enemies
• increases enemy movement speed by 25%; does not apply to Flamers and Bombers
• grants immunity to suppression
• increases enemy hit mass by 50% which makes enemies harder to cleave; weapon blessings like Devastating Strike, Perfect Strike, Savage Sweep, Shock & Awe, Sunder, and Wrath that buff an attack's effective hit mass limit can mitigate this effect

Moebian 21st

Icon       

Mechanics

Report indicates that infected 21st troopers have been sighted in this area.

This mutator replaces any Groaner or Poxwalker with an Armored Groaner. Armored Groaners deal the same damage as Groaners and Poxwalkers, are slightly more resistant to stagger, and have the following stats:

Breed	Health (Damnation)	Armor Type	Hit Mass (Damnation)	Ranged Damage Multipliers
Armored Groaner	625	• Flak (base) • Unarmoured (head, lower arms, legs)	1.5	Lower Arms: 70% less Lower Legs: 80% less
Groaner	300	Unarmoured	1.25	Lower Arms: 25% less Lower Legs: 25% less
Poxwalker	375	Infested	1.5	Lower Arms: 50% less Lower Legs: 50% less

Pus-hardened Skin

Icon       

Mechanics

Some enemies in this sector have been "blessed" by their foul gods, hardening their skin.

This mutator grants a chance that enemies receive a set of changes when they spawn:

10%	Bruisers, Scab Shooter, Stalkers, Daemonhost
20%	Scab Captain
25%	Mauler, Scab Rager, Shotgunners, Scab Bomber
30%	Dreg Rager, Pox Hound
35%	Dreg Tox Bomber, Flamers, Sniper, Trapper
50%	Bulwark, Gunners, Reaper, Poxburster

* Enemy breeds that are not listed cannot be affected by this mutator.

Enemies affected by 'Pus-hardened Skin' receive the following changes:

• adds green-yellowish VFX with dripping particles to enemies' bodies
• reduces the damage enemies take from ranged attacks; the effective damage reduction scales per Havoc Rank being lowered by 1% flat per increasing Havoc Rank:

Havoc Rank	1	2 to 10	11 to 20	21 to 30	31 to 39	40
Ranged DR	89%	88% to 80%	79% to 70%	69% to 60%	59% to 51%	50%

While this 'inverted' scaling seems counter-intuitive at first, it can be assumed that it was chosen to account for the base difficulty increases (from Malice up to Damnation) and also for the additional Havoc modifiers (especially more enemy health). The current implementation ensures a somewhat consistent effect over all Havoc Ranks: high damage reduction when enemies have comparatively low health, and lower damage reduction when enemies have high health.

The Blight Spreads

Icon       

Mechanics

Reports indicate a large concentration of highly corrupted enemies in this area. Beware!

This mutator grants a chance that enemies spawn corrupted:

10%	Armored Groaner, Groaner, Bruisers, Poxwalker, Scab Shooter, Stalkers, Bulwark, Crusher, Gunners, Mauler, Ragers, Reaper, Shotgunners, Bombers, Flamers, Mutant, Poxburster, Pox Hound, Sniper, Daemonhost
20%	Scab Captain
100%	Plague Ogryn

* Enemy breeds that are not listed cannot spawn corrupted.

Enemies affected by 'The Blight Spreads' receive the following changes:

• adds greenish VFX with fly-like particles to enemies' bodies
• when a corrupted enemy dies, there is a chance that the corruption spreads to other enemies within 3m
• when a corrupted enemy dies, a puddle of Nurgle Slime is created on the ground; this slime has the same properties as the slime created by Beast of Nurgle (see the 'Player Debuffs' section below) except for lasting for 19s and dealing 5 base corruption damage (Damnation) per tick which increases to 6.25 corruption damage per tick while sliding or dodging on slime

Havoc Mutators (Part II)

The Emperor's Fading Light (1)

Icon       

Mechanics

Auric Intensity activated. Enemies shoot faster. No Toughness grace period.

This mutator is active in Havoc Rank 16 missions and above making changes to several gameplay mechanics:

• the grace period when toughness breaks is disabled; for details on toughness broken grace see the respective 'Player Buffs' section below
• increases the number of shots fired per shooting action by 50% for Gunners, Reaper, Scab Shooter, Stalkers, and Captains; for example, a Scab Stalker fires 4 shots per action but when buffed now fires 6 shots per action; or a Reaper who normally fires 60 shots now fires 90 shots when buffed; this effect stacks multiplicatively with the hidden Havoc modifier that buffs enemy ranged attacks
• halves the cooldown of enemy shooting actions so they can fire more often; this applies to any regular hit scan shooting action; does not apply to Sniper
• reduces the overall amount of tension added by 50%; tension is one of the core metrics that the AI director considers while controlling the pacing of the game: for example, when players take damage (to toughness or health), are netted, pounced, or knocked down, specific amounts of tension are added to a total and, depending on certain tension thresholds, the pacing (enemies spawning in and such) can be slowed down or sped up; this modifier results in the AI director being less 'merciful' on average; on player death, tension will also no longer get maxed out immediately
• additionally to regular monsters, allows Captains to spawn; this is mainly based on travel distance, so after players have progressed a certain amount, a Captain spawn will be injected; the type of Captain (Dreg or Scab) depends on the enemy faction of the current map section
• lowers the requirements for when hordes can spawn

The Emperor's Fading Light (2)

Icon       

Mechanics

Tension doesn't affect spawn allowance. Auric Intensity activated. Enemies shoot faster. No Toughness grace period.

This mutator is active in Havoc Rank 30 missions and above, additionally to the changes introduced by the first tier of 'The Emperor's Fading Light', making further changes to gameplay mechanics:

• increases the stagger_thresholds of enemies across the board which makes enemies harder to stagger; along with the effective stagger strength of an attack, these thresholds are considered to determine the type of stagger enemies can be put into (light, medium, heavy, etc); see this video for how stagger works, see this Steam guide for the full table detailing the regular and buffed stagger_thresholds
• allows the AI director to spawn in any spawn type (hordes, specials, monsters, roamers) regardless of current tension states
• halves the time between the horde spawn sounds and when the hordes actually spawn in; down to 3.5s (from 7s)
• lowers the travel distance requirement for when Captains can be injected
• lowers the requirements for when hordes can spawn even further

Havoc Hidden Modifiers (Part I)

Reduced Player Health

 
stat buff: max_health_modifier

Reduces a character's maximum health; also applies to health while downed. Stacks additively with max health buffs from curio blessings, curio perks and small talent nodes.

For example, an Ogryn playing a Havoc Rank 30 mission with three +21% health curios, each with a +5% health curio perk, and a 10% health small talent node will have his base max health of 300 increased by 300x(-0.35+0.63+0.15+0.1)=159 to 459 health total. If this Ogryn drops all health curios and only keeps the small talent node, his base max health of 300 would be reduced by 300x(-0.35+0.1)=-75 to 225 health total.

Tier 1	-15%	active from 1 to 10
Tier 2	-20%	active from 11 to 20
Tier 3	-25%	active from 21 to 22
Tier 4	-30%	active from 23 to 25
Tier 5	-35%	active from 26 to 40

Reduced Player Toughness

 
stat buff: toughness

Removes a flat amount of toughness from a character's base maximum toughness. Stacks additively with flat toughness increases from small talent nodes, the sum stacks multiplicatively with toughness percentage buffs from curio blessings and curio perks.

For example, a Veteran playing a Havoc Rank 34 mission with one +15 toughness, one +25 toughness small talent node, and three +16% toughness curios will have their base max toughness of 100-45+15+25=95 increased by 95x0.48=45.6 to 140.6 toughness total (HUD rounds up: 141).

Tier 1	-10	active from 2 to 11
Tier 2	-15	active from 12 to 18
Tier 3	-30	active from 19 to 23
Tier 4	-40	active from 24 to 32
Tier 5	-45	active from 33 to 40

Reduced Coherency Toughness Regeneration

 
stat buff: toughness_regen_rate_modifier

Reduces a character's base amount of toughness regenerated while in coherency; stacks additively with the same buff from Toughness Regeneration Speed (TRS) from curios, and talents like Ogryn's Feel No Pain, Lynchpin, Stay Close!, or Veteran's small talent node Inspiring Presence; stacks multiplicatively during calculation with Zealot's Fortitude in Fellowship and Loner.

0	0	0	0	0	1.875
1	3.75	1.875	5.25	3.75	3.75
2	5.625	2.8125	7.875	5.625	4.6875
3	7.5	3.75	10.5	7.5	5.625

Tier 1	-15%	active from 2 to 12
Tier 2	-20%	active from 13 to 15
Tier 3	-30%	active from 16 to 24
Tier 4	-40%	active from 25 to 33
Tier 5	-50%	active from 34 to 40

Reduced Ammo Pickup Amount

Reduces the amount of ammo gained from small or big ammo pickups and from deployable ammo packs:

Small	15%	12.75%	9.75%	7.5%	5.25%	3.75%
Big	50%	42.5%	32.5%	25%	17.5%	12.5%
Deployable	100%	85%	65%	50%	35%	25%

For example, playing a Havoc Rank 35 mission with a ranged weapon that has 56 max ammo in reserve, a small pickup will refill 56x0.0375=2.1 ammo which is rounded up to 3; a big pickup will refill 56x0.125=7 ammo.

Tier 1	15%	active from 3 to 13
Tier 2	35%	active from 14 to 20
Tier 3	50%	active from 21 to 23
Tier 4	65%	active from 24 to 29
Tier 5	75%	active from 30 to 40

Reduced Quelling Speed

 
stat buff: vent_warp_charge_speed

Reduces the speed at which peril is quelled. Applies only to active quelling, passive quelling is unaffected. Stacks multiplicatively with the same buff from Psyker's talent Solidity and during calculation with the quelling buff from Celerity Stimm.

Tier 1	15%	active from 3 to 13
Tier 2	35%	active from 14 to 20
Tier 3	50%	active from 21 to 23
Tier 4	75%	active from 24 to 29
Tier 5	85%	active from 30 to 40

Havoc Hidden Modifiers (Part II)

Increased Terror Event Spawn Rate

Effectively increases the spawn rate of enemies during terror events. 'Terror events' are all premade events in the game that are not controlled by the usual AI director. These events are essentially a list of elements/actions that is activated when players reach a certain area, and that the game will go through in order, until the end of the list, or until some other action/event stops it midway.

Tier 1	active from 4 to 14
Tier 2	active from 15 to 18
Tier 3	active from 19 to 25
Tier 4	active from 26 to 32
Tier 5	active from 33 to 40

Increased Elite Health

Increases the maximum health of enemies with the elite tag.

For example, Ragers have 1250 health on Malice and 2000 health on Damnation. In a Havoc Rank 7 mission, Ragers would have 1250x1.1=1375 health. Whereas in a Havoc Rank 31 mission, Ragers would have 2000x1.25=2500 health.

Breeds with elite tag: Bulwark, Crusher, Gunners, Mauler, Ragers, Reaper, Shotgunners

Tier 1	10%	active from 5 to 17
Tier 2	15%	active from 18 to 22
Tier 3	20%	active from 23 to 28
Tier 4	25%	active from 29 to 38
Tier 5	50%	active from 39 to 40

Increased Special Health

Increases the maximum health of enemies with the special tag.

For example, a Trapper has 562.5 health on Malice and 900 health on Damnation. In a Havoc Rank 9 mission, a Trapper would have 562.5x1.1=618.75 health. Whereas in a Havoc Rank 39 mission, a Trapper would have 900x1.5=1350 health.

Breeds with special tag: Bombers, Flamers, Mutant, Poxburster, Pox Hound, Sniper, Trapper

Tier 1	10%	active from 5 to 18
Tier 2	15%	active from 19 to 24
Tier 3	20%	active on 25
Tier 4	25%	active from 26 to 37
Tier 5	50%	active from 38 to 40

Increased Max Specials

Increases the maximum amount of specials that can be alive at the same time by a flat amount.

For example, on regular Damnation without any active difficulty mutators (and without any triggered intervention systems like rush or speedrunning prevention), up to 8 specials can be alive at the same time. With Tier 5 of this Havoc modifier, up to 14 specials can be alive at the same time.

Breeds with special tag: Bombers, Flamers, Mutant, Poxburster, Pox Hound, Sniper, Trapper

Tier 1	2	active from 5 to 14
Tier 2	3	active from 15 to 23
Tier 3	4	active from 24 to 25
Tier 4	5	active from 26 to 35
Tier 5	6	active from 36 to 40

Monster Buff

This modifier does two things: (1) Increases the maximum amount of monsters that can spawn during a mission by a flat amount. (2) Increases the maximum health of enemies with the monster tag.

For example, a Plague Ogryn has 40000 health on Heresy and 60000 health on Damnation. In a Havoc Rank 17 mission, a Plague Ogryn would have 40000x1.2=48000 health. Whereas in a Havoc Rank 38 mission, a Plague Ogryn would have 60000x1.7=102000 health.

Breeds with monster tag: Beast of Nurgle, Chaos Spawn, Daemonhost, Plague Ogryn

Tier 1	10%	1	active from 6 to 15
Tier 2	20%	1	active from 16 to 23
Tier 3	30%	2	active from 23 to 26
Tier 4	40%	3	active from 27 to 36
Tier 5	70%	3	active from 37 to 40

Havoc Hidden Modifiers (Part III)

Horde Buff

This modifier does two things: (1) Increases the maximum health of enemies with the horde tag. (2) Increases the hit mass of enemies with the horde tag which makes them harder to cleave.

For example, an Armored Groaner has 625 health and 1.5 hit mass on Damnation. In a Havoc Rank 36 mission, an Armored Groaner would have 625x1.35=843.75 health and a hit mass of 1.5x3.2=4.8.

Note that this modifier's buff to enemy hit mass stacks multiplicatively with the related buff from 'Cranial Corruption' (or 'Pox Gas'): So the same Armored Groaner, if also affected by 'Cranial Corruption', would have a hit mass of 1.5x3.2x1.5=7.2. Weapon blessings like Devastating Strike, Perfect Strike, Savage Sweep, Shock & Awe, Sunder, and Wrath that buff an attack's effective hit mass limit can mitigate this effect.

Breeds with horde tag: Armored Groaner, Groaner, Poxwalker, Poxwalker (lesser mutated), Poxwalker (mutated)

Tier 1	10%	40%	active from 7 to 16
Tier 2	15%	80%	active from 17 to 19
Tier 3	20%	100%	active from 20 to 24
Tier 4	25%	150%	active from 25 to 34
Tier 5	35%	220%	active from 35 to 40

Increased Enemy Melee Attack Speed

Increases the animation speed of enemy melee attacks (including kicks, punches, stomps, Bulwark shield pushes, etc).

Note that this also increases the speed of the recovery animation of enemies after an attack has been blocked by players.

Tier 1	20%	active from 8 to 16
Tier 2	35%	active from 17 to 21
Tier 3	50%	active from 22 to 26
Tier 4	75%	active from 27 to 31
Tier 5	100%	active from 32 to 40

Enemy Ranged Attacks Buff

This modifier does two things: (1) Increases the animation speed of enemy hit scan ranged attacks. (2) Increases the number of shots fired per shooting action for Gunners, Reaper, Scab Shooter, Stalkers, and Captains.

For example, a Dreg Stalker fires either 4 or 5 shots per action. In a Havoc Rank 35 mission, a Dreg Stalker would fire either 9 or 12 shots per action. Note, however, that this buff stacks multiplicatively with the related effect from the first tier of 'The Emperor's Fading Light': So in this case, the Dreg Stalker would now actually fire 14 or 17 shots per action.

Tier 1	10%	25%	active from 8 to 16
Tier 2	15%	50%	active from 17 to 21
Tier 3	20%	75%	active from 22 to 26
Tier 4	25%	100%	active from 27 to 31
Tier 5	30%	125%	active from 32 to 40

Enemy Melee Corruption

Enables all enemy melee attacks to deal a specific portion of their damage as corruption damage. This effect stacks additively with the corruption damage ratio that some enemies (e.g. Poxwalker) have already defined in their attacks' damage profiles.

For example, a Poxwalker deals 84 damage (Damnation) with melee attacks. By default, 25% of this damage is dealt as corruption damage when dealing health damage. So from one Poxwalker melee hit, a player would take 84x0.75=63 regular damage and 84x0.25=21 corruption damage. In a Havoc Rank 34 mission, a Poxwalker deals 25%+30%=55% of their damage as corruption damage, and a player would take (also accounting for the enemy melee power increase) 126x0.45=56.7 regular damage and 126x0.55=69.3 corruption damage from one Poxwalker melee hit.

Note that this modifier's effect can lead to players who are not on their last wound being killed right away (instead of being knocked down first) by melee hits that deal very high damage (e.g. Mauler or Crusher overhead attacks). This is due to the fact that the corruption damage portion, especially considering reduced player max health in Havoc missions, can be high enough to convert one or more health segments to full corruption during damage taken calculation, thereby 'skipping' the knock down condition.

The amount of corruption damage taken can be reduced by Corruption Resistance from curios.

Tier 1	10%	active from 9 to 17
Tier 2	15%	active from 18 to 21
Tier 3	20%	active from 22 to 24
Tier 4	25%	active from 25 to 32
Tier 5	30%	active from 33 to 40

Increased Enemy Melee Power

Increases the power level of enemy melee attacks (including kicks, punches, stomps, Bulwark shield pushes, etc) which increases their damage.

For example, a Crusher deals 80 damage (Damnation) with his fist punch. In a Havoc Rank 29 mission, a Crusher would deal 112 damage with the same attack.

Tier 1	10%	active from 9 to 13
Tier 2	20%	active from 14 to 15
Tier 3	30%	active from 16 to 27
Tier 4	40%	active from 28 to 31
Tier 5	50%	active from 32 to 40

Havoc Hidden Modifiers (Part IV)

Increased Horde Spawn Rate

Increases the rate at which hordes and ambushes can spawn while regular horde pacing is active; this does not affect the amount of enemies spawned in hordes and ambushes.

Tier 1	20%	active from 10 to 14
Tier 2	40%	active from 15 to 19
Tier 3	60%	active from 20 to 24
Tier 4	80%	active from 25 to 29
Tier 5	100%	active from 30 to 34
Tier 6	120%	active from 35 to 39
Tier 7	140%	active on 40

Increased Elite Roamer Spawns

Increases the amount of non-ogryn enemies with the elite tag in enemy roamer packs. 'Roamers' are ambient enemies that populate a map either by standing around in stationary groups or by patrolling around in small groups (these mini patrols are different from actual patrols). Roamers spawn ahead of players when progressing through the map and are unaffected by horde pacing. The compositions of roamer packs are predetermined and this modifier increases the maximum amount of non-ogryn elites that can spawn per pack.

Non-ogryn breeds with elite tag: Gunners, Mauler, Ragers, Shotgunners

Tier 1	15%	active from 10 to 19
Tier 2	-	-
Tier 3	50%	active from 20 to 28
Tier 4	75%	active from 29 to 30
Tier 5	100%	active from 31 to 40

Increased Ogryn Roamer Spawns

Increases the amount of elite enemies with the ogryn tag in enemy roamer packs. 'Roamers' are ambient enemies that populate a map either by standing around in stationary groups or by patrolling around in small groups (these mini patrols are different from actual patrols). Roamers spawn ahead of players when progressing through the map and are unaffected by horde pacing. The compositions of roamer packs are predetermined and this modifier increases the maximum amount of ogryn elites that can spawn per pack.

Elite breeds with ogryn tag: Bulwark, Crusher, Reaper

Tier 1	15%	active from 10 to 19
Tier 2	-	-
Tier 3	50%	active from 20 to 27
Tier 4	75%	active from 28 to 30
Tier 5	100%	active from 31 to 40

Player Debuffs (Part I)

Beast of Nurgle Vomit

Icon       

Mechanics

 
Being hit directly by Beast of Nurgle's vomit action applies a debuff that has the following effects:

stat buffs:
movement_speed
dodge_speed_multiplier

• Duration: 10s; can be refreshed when vomited on again
• Marks the player as a potential target to be consumed by Beast of Nurgle; Beast of Nurgle only tries to eat players that have been vomited on
• Reduces player movement speed by 15% (can stack up to 3 times); stacks additively with the movement speed reduction from Nurgle Slime on the ground and with movement speed buffs from talents and weapon blessings; stacks multiplicatively with sprinting speed buffs (Zealot's Swift Certainty)
• Reduces dodge speed by 10% (can stack up to 3 times); stacks multiplicatively with itself and with dodge speed buffs from Veteran's Weapons Specialist and Zealot's Inexorable Judgement
• Health Damage: the debuff itself deals no damage but the direct vomit hit that applies the debuff deals 2.8 base corruption damage (Damnation) per instance
• Toughness Damage: ignores toughness dealing damage immediately to health instead

Nurgle Slime

Icon       

Mechanics

 
Nurgle Slime on the ground can be created by Beast of Nurgle (vomit and slime trail), by the Phage Tree in Hab Dreyko, by corrupted enemies on death in Havoc missions ('The Blight Spreads'), and by map props like Corruptors (when destroying their eyes) or the lab tanks in Warren.

Since the map prop slime has no additional properties besides dealing corruption damage, this section details only the Nurgle Slime created by Beast of Nurgle; the Phage Tree slime has the same properties as the Beast of Nurgle slime (except for having half the duration and dealing twice as much corruption damage); 'The Blight Spreads' slime deals double the damage.

Nurgle Slime lasts for 20s; note that the yellow goo VFX is roughly 1s shorter than the actual effect duration. Nurgle Slime has the following effects on players who are in it:

buff keyword: zero_slide_friction

stat buffs:
movement_speed
dodge_speed_multiplier

• Reduces player movement speed by 20%; stacks additively with the movement speed reduction from Beast of Nurgle vomit and with movement speed buffs from talents and weapon blessings; stacks multiplicatively with sprinting speed buffs (Zealot's Swift Certainty)
• Reduces dodge speed by 10%; stacks multiplicatively with dodge speed buffs from Veteran's Weapons Specialist and Zealot's Inexorable Judgement
• Removes friction while sliding on slime which allows to keep sliding until back on normal ground
• Tick Rate: every 0.35s; while sliding or dodging, every 0.25s
• Health Damage: 2.5 base corruption damage per tick (Damnation) which increases to 3.125 corruption damage per tick while sliding or dodging on slime; knocked down players take 75% less damage
• Toughness Damage: ignores toughness dealing damage immediately to health instead

Player Debuffs (Part II)

Ground Fire

Icons       

Mechanics

 
There are effectively four different ground fire templates that vary slightly in their effects on players: ground fire from (1) flamethrower trails of Dreg Tox Flamer and Scab Flamer, (2) Scab Bomber grenades, (3) Scab Flamer tank explosion and fire barrels, and (4) Dreg Flamer tank explosion.

(1) Dreg Tox Flamer / Scab Flamer (Flamethrower Trail)

buff keyword: prevent_toughness_replenish_except_abilities

stat buffs:
toughness_regen_rate_multiplier
spread_modifier

• Duration: 11s
• Coherency Toughness Regeneration: disabled
• Toughness Replenishment: any toughness replenishment from melee kills, talents, or weapon blessings is disabled except for Veteran's Voice of Command and Zealot's Chorus of Spiritual Fortitude
• Tick Rate: every 0.35s
• Health Damage: deals 12 base damage per tick (Damnation) which increases over the first 17 ticks[i.imgur.com]; knocked down players take 75% less damage
• Toughness Damage: 4x multiplier
• Weapon Spread: after leaving ground fire, increases ranged weapon spread by 100% which decreases linearly over 1.75s until losing its effect; stacks additively with spread reductions from talents and weapon blessings

(2) Scab Bomber

buff keyword: prevent_toughness_replenish_except_abilities

stat buffs:
toughness_regen_rate_multiplier
movement_speed
spread_modifier

• Duration: 8s
• Extension: 100 units; adjusts to map geometry
• Coherency Toughness Regeneration: disabled
• Reduces player movement speed by 20%; stacks additively with other movement speed reductions and with movement speed buffs from talents and weapon blessings; stacks multiplicatively with sprinting speed buffs (Zealot's Swift Certainty)
• Toughness Replenishment: any toughness replenishment from melee kills, talents, or weapon blessings is disabled except for Veteran's Voice of Command and Zealot's Chorus of Spiritual Fortitude
• Tick Rate: every 0.35s
• Health Damage: deals 15 base damage per tick (Damnation) which increases over the first 17 ticks[i.imgur.com]; knocked down players take 75% less damage
• Toughness Damage: 4x multiplier
• Weapon Spread: after leaving ground fire, increases ranged weapon spread by 100% which decreases linearly over 1.75s until losing its effect; stacks additively with spread reductions from talents and weapon blessings

(3) Scab Flamer (Tank Explosion) / Fire Barrel

stat buffs:
movement_speed
spread_modifier

• Duration: 12s (tank explosion), 15s (fire barrel)
• Extension: 85 units; adjusts to map geometry; incentivizes enemies to path around it
• Reduces player movement speed by 25%; stacks additively with other movement speed reductions and with movement speed buffs from talents and weapon blessings; stacks multiplicatively with sprinting speed buffs (Zealot's Swift Certainty)
• Tick Rate: every 0.5s
• Health Damage: deals 10 base damage per tick (Damnation); knocked down players take 75% less damage
• Toughness Damage: ignores toughness dealing damage immediately to health instead
• Weapon Spread: after leaving ground fire, increases ranged weapon spread by 100% which decreases linearly over 1.75s until losing its effect; stacks additively with spread reductions from talents and weapon blessings

(4) Dreg Tox Flamer (Tank Explosion)

buff keyword: prevent_toughness_replenish_except_abilities

stat buffs:
toughness_regen_rate_multiplier
spread_modifier

• Duration: 12s
• Extension: 85 units; adjusts to map geometry; incentivizes enemies to path around it
• Coherency Toughness Regeneration: disabled
• Toughness Replenishment: any toughness replenishment from melee kills, talents, or weapon blessings is disabled except for Veteran's Voice of Command and Zealot's Chorus of Spiritual Fortitude
• Tick Rate: every 0.35s
• Health Damage: deals 12 base damage per tick (Damnation) which increases over the first 17 ticks[i.imgur.com]; knocked down players take 75% less damage
• Toughness Damage: 4x multiplier
• Weapon Spread: after leaving ground fire, increases ranged weapon spread by 100% which decreases linearly over 1.75s until losing its effect; stacks additively with spread reductions from talents and weapon blessings

Player Debuffs (Part III)

Toxic Gas (Player Debuff)

Icon       

Mechanics

 
For details on the buffs enemies receive from toxic gas see the respective 'Difficulty Mutators' section above.

There are effectively three different toxic gas templates that vary slightly in their effects on players: toxic gas from (1) Dreg Tox Bomber grenades, (2) the 'Pox Gas' mutator, and (3) Karnak Twins events.

(1) Dreg Tox Bomber

buff keyword: concealed

stat buffs:
toughness_coherency_regen_rate_multiplier
toughness_regen_rate_multiplier
toughness_replenish_modifier

• Duration: 16s
• Extension: 80 units; adjusts to map geometry
• Tick Rate: every 0.75s
• Health Damage: 10 base damage per tick (Damnation) of which 8 are dealt as corruption damage and 2 as regular damage; note that if a player does not yet have any corruption damage taken, the first tick deals 10 total damage (8:2 ratio) and subsequent ticks then only deal 8 base corruption damage per tick; knocked down players take 75% less damage
• Toughness Damage: 7x multiplier
• Coherency Toughness Regeneration: disabled
• Toughness Replenishment: any amount of toughness replenished by melee kills, talents, or the Momentum weapon blessing is reduced by 30%; stacks additively with the toughness replenishment buff from Ogryn's Too Stubborn To Die, Veteran's Tunnel Vision, or Zealot's Blood Redemption, and multiplicatively with Psyker's Empyric Resolve
• Concealment: players inside toxic gas count as being 'concealed' which provides the same effect like Veteran's Smoke Grenade
• Outlines: players inside toxic gas do not see the outlines of team mates or pinged enemies; this also disables outlines applied by talents like Veteran's Executioner's Stand, Focus Target!, or Psyker's Disrupt Destiny

(2) Pox Gas Mutator

buff keyword: concealed

stat buffs:
toughness_coherency_regen_rate_multiplier
toughness_regen_rate_multiplier
toughness_replenish_modifier

• Duration: between 16s to 20s; the build up phase of 8.5s has no effect
• Tick Rate: every 0.75s
• Health Damage: 10 base damage per tick (Damnation) of which 8 are dealt as corruption damage and 2 as regular damage; note that if a player does not yet have any corruption damage taken, the first tick deals 10 total damage (8:2 ratio) and subsequent ticks then only deal 8 base corruption damage per tick; knocked down players take 75% less damage
• Toughness Damage: 7x multiplier
• Coherency Toughness Regeneration: disabled
• Toughness Replenishment: any amount of toughness replenished by melee kills, talents, or the Momentum weapon blessing is increased by 50%; stacks additively with the toughness replenishment buff from Ogryn's Too Stubborn To Die, Veteran's Tunnel Vision, or Zealot's Blood Redemption, and multiplicatively with Psyker's Empyric Resolve
• Concealment: players inside toxic gas count as being 'concealed' which provides the same effect like Veteran's Smoke Grenade
• Outlines: players inside toxic gas do not see the outlines of team mates or pinged enemies; this also disables outlines applied by talents like Veteran's Executioner's Stand, Focus Target!, or Psyker's Disrupt Destiny

(3) Karnak Twins

buff keywords:
concealed
prevent_toughness_replenish_except_abilities

stat buff: toughness_regen_rate_multiplier

• Duration: gas phases during boss fight (Damnation) can last between 20s and 25s (first phase) and 15s and 22s (subsequent phases); with Hard Mode enabled, gas phases can last between 14s and 18s; gas during boss ambushes lasts until boss vanishes
• Tick Rate: every 0.25s
• Health Damage: up to 10 base corruption damage per tick (Damnation) which scales per time spent in toxic gas dealing full damage per tick after 12s; knocked down players take 75% less damage
• Toughness Damage: 3x multiplier
• Coherency Toughness Regeneration: disabled
• Toughness Replenishment: any toughness replenishment from melee kills, talents, or weapon blessings is disabled except for Veteran's Voice of Command and Zealot's Chorus of Spiritual Fortitude
• Concealment: players inside toxic gas count as being 'concealed' which provides the same effect like Veteran's Smoke Grenade
• Outlines: players inside toxic gas do not see the outlines of team mates or pinged enemies; this also disables outlines applied by talents like Veteran's Executioner's Stand, Focus Target!, or Psyker's Disrupt Destiny
• When leaving toxic gas, deals one tick of 4 base corruption damage

Player Buffs

Spawn Grace

Icon       

Mechanics

 
Players who hotjoin a game receive the following buffs for 5s:

buff keyword: unperceivable

stat buff: damage_taken_multiplier

• Players are unperceivable so they cannot be targeted by enemies; this is similar to being invisible
• Players do not take any damage

Toughness Broken Grace

When toughness reaches 0, the power level of incoming enemy ranged hit scan attacks (excluding shotgun blasts) is reduced by a specific amount for a specific duration. This reduces the base damage of enemy attacks before any applicable damage reduction on the player side (talents, curios, etc) is considered. Additionally, the weapon spread of attacking enemy ranged units is increased. Once procced, these effects go on cooldown.

Sedition	85%	2s	300%	1.5s
Uprising	80%	1.5s	300%	2s
Malice	70%	1.25s	250%	3s
Heresy	60%	1s	200%	5s
Damnation	50%	1s	200%	8s

Stamina on Damage Taken

function: add_stamina

Only while current stamina is below 50% of max stamina, taking any damage to toughness or health from enemy melee or ranged attacks (also from ground fire, toxic gas, and Nurgle slime) replenishes 1 flat stamina per damage instance. This effect has no internal cooldown and stops immediately when above 50% max stamina.

Dogpile Protection

When more than two slots are occupied around the player unit, the power level of incoming enemy melee attacks is reduced. This reduces the base damage of enemy attacks before any applicable damage reduction on the player side (talents, curios, etc) is considered.

Slots Occupied	1	2	3	4	5	6	7+
Power Level Reduction	-	-	10%	15%	30%	35%	50%

For example, if a player is fighting against two Scab Bruisers, each Bruiser deals 72 damage (Damnation) per melee attack. If a player is fighting against four Scab Bruisers, each Bruiser now deals 61.2 damage per melee attack; if fighting against six Bruisers, each Bruiser deals 46.8 damage per melee attack, etc.

Slot system
Darktide's slot system is similar to Vermintide 2's slot system. It structures the game's melee combat on a fundamental level. There are three different types of slots: normal, medium, and large. A player unit can have up to 9 normal slots attached to it, up to 8 medium slots, and up to 5 large slots; large slots are occupied by monsters (Beast of Nurgle, Chaos Spawn, Daemonhost, Plague Ogryn) and enemy ogryns (Bulwark, Crusher, Reaper), medium slots are occupied by Mauler and Ragers, and normal slots by any other enemy breed (including Captains/Twins). Enemies who are in ranged combat do not occupy these slots. The effective amount of occupied slots can vary depending on certain factors during gameplay (overlapping slots getting disabled, navmesh limitations because of map geometry, etc).

[GeezusCryst]

Extremely helpful as a new player thank you!