How stacking works?

[id795078477]

.. if at all? For instance, what happens if:

-- The character has a resistance to some damage and then also vulnerability to it? (Like - say, the minotaur amulet + stoneskin)?
-- The character has double resistance from different sources?
-- The character has double advantage on the same roll?
-- The character has both disadvantage and advantage on the same roll?

[Fluff]

Double, triple, quadriple advantage - only 1. You can either have or don't have advantage or disadvantage. If it's disadvantage from 1 thing, advantage from another - it will be a normal roll, they + - remove each other.

Resistance - same. You either have it or don't have it. Having same resistance from many sources doesn't make it turn into immunity.

[lockedmind]

Double resistance does nothing (don't stack).
Double advantage does nothing (don't stack).
Advantages and disadvantages negate each other 1:1, so if you have more ads then disads then you will roll with an advantage and vice versa.
Vulnerability trumps resistance, I think, but I'm not sure about that one.

[Fringehunter7719]

Originally posted by lockedmind:

Advantages and disadvantages negate each other 1:1, so if you have more ads then disads then you will roll with an advantage and vice versa.

I haven't tested this myself, but it doesn't work that way in 5th Ed. Are you sure Larian did it this way?

I found an old reddit post claiming they matched it to tabletop rules - any amount cancels all instances of the other, rather than 1:1. But that could be unreliable.

Originally posted by lockedmind:

Vulnerability trumps resistance, I think, but I'm not sure about that one.

Just tested this, and it displayed that way on the resistances page, but the damage numbers seemed to imply they just cancel:
https://steamcommunity.com/sharedfiles/filedetails/?id=3035131461
https://steamcommunity.com/sharedfiles/filedetails/?id=3035131625

It shouldn't be possible for a fire vulnerable Karlach to get hit for 5 damage (because doubling would make it an even number).

[Dr.Fumetastic]

Originally posted by lockedmind:

Advantages and disadvantages negate each other 1:1, so if you have more ads then disads then you will roll with an advantage and vice versa.

From what I remember it doesn't actually matter how many advantages/disadvantages you have. Unequal amounts of advantage/disadvantage cancel each other out aswell.

[wendigo211]

Originally posted by Fringehunter7719:

Originally posted by lockedmind:

Advantages and disadvantages negate each other 1:1, so if you have more ads then disads then you will roll with an advantage and vice versa.

I haven't tested this myself, but it doesn't work that way in 5th Ed. Are you sure Larian did it this way?

I found an old reddit post claiming they matched it to tabletop rules - any amount cancels all instances of the other, rather than 1:1. But that could be unreliable.

Originally posted by lockedmind:

Vulnerability trumps resistance, I think, but I'm not sure about that one.

Just tested this, and it displayed that way on the resistances page, but the damage numbers seemed to imply they just cancel:
https://steamcommunity.com/sharedfiles/filedetails/?id=3035131461
https://steamcommunity.com/sharedfiles/filedetails/?id=3035131625

It shouldn't be possible for a fire vulnerable Karlach to get hit for 5 damage (because doubling would make it an even number).

According to 5e raw: If you have advantage and disadvantage they cancel and you get nothing. It doesn't matter if you have 1000 conditions that apply advantage and one condition that applies disadvantage, you get nothing. I'm pretty sure it works the same way in BG3.

You can read about resistance and vulnerability here: https://5e.d20srd.org/srd/combat/damageAndHealing.htm#damageResistanceAndVulnerability

You only get the effects of resistance and vulnerability once and they should cancel each other. E.g. if you take 20 points of damage, resistance will halve it to 10 and then vulnerability will double it to 20.

[Risk Raines]

When you cast something that stacks, you will see a tooltip that pops up, showing text that you casted X spell. If you see a line through a spell you cast, then the effect is being canceled by a previous or current cast.

[Risk Raines]

Vulnerability is not "Invulnerability" Resistance and Vuln are opposites in this game.
Resistance means you take that much less damage to that damage type. Vulnerability means a creature takes double damage.

[Risk Raines]

Damage Resistance and Vulnerability
Some creatures and objects are exceedingly difficult or unusually easy to hurt with certain types of damage.

If a creature or an object has resistance to a damage type, damage of that type is halved against it. If a creature or an object has vulnerability to a damage type, damage of that type is doubled against it.

Resistance and then vulnerability are applied after all other modifiers to damage. For example, a creature has resistance to bludgeoning damage and is hit by an attack that deals 25 bludgeoning damage. The creature is also within a magical aura that reduces all damage by 5. The 25 damage is first reduced by 5 and then halved, so the creature takes 10 damage.

Multiple instances of resistance or vulnerability that affect the same damage type count as only one instance. For example, if a creature has resistance to fire damage as well as resistance to all nonmagical damage, the damage of a nonmagical fire is reduced by half against the creature, not reduced by three-quarters.

[lockedmind]

Originally posted by Dr.Fumetastic:

Originally posted by lockedmind:

Advantages and disadvantages negate each other 1:1, so if you have more ads then disads then you will roll with an advantage and vice versa.

From what I remember it doesn't actually matter how many advantages/disadvantages you have. Unequal amounts of advantage/disadvantage cancel each other out aswell.

You are right. I just tested it with 1 advantage and 2 disadvantages and the resulting roll didn't have any.