Enemy Details and One-Shot Tips

All repeatable enemies, their location in the battle arena lineup, and some tips and tricks for one-shot achievements. Also includes the name of the associated achievement, as it is often different from the enemy name.

Preamble

Accuracy of Information

All of this is hand-compiled and some may be incorrect; there's a lot of enemies here and my memory isn't perfect. If you see something that's wrong, leave a comment and I'll fix it.

I'd love to have the song that plays for each enemy here, but I'm not going to compile that. If you'd like to, and want to add it, I'll happily add you as a collaborator.

How many notes to one-shot?

Check your damage on an easy enemy. Damage numbers seem to be consistent across enemies; weakness seems to be 2x damage taken, and damage seems to scale linearly with note count (See Below). Check how much you do with the strongest attack your weapon has, and you should be able to divide the damage by the number of notes and get a rough idea of how much damage you do per note. Divide the enemy's HP by that number to get an idea of how many notes you need to one-shot them.

Originally posted by Phantom:

It's possible this is specific to Corrupted Irvine, but from an hour or 2 of testing it appears damage does NOT scale linearly with note count. With my heavy attack starting at 14, notes 15-19 scaled with diminishing returns, like really really terribly. Interestingly, at note 20 it jumped up in value started scaling WAY better, with each note being worth increasingly slightly more than the last. I tried using a couple different regression models in Desmos to see what worked best, and the closest 3 are Cubic, Quartic, and Power. Power Regression looked like it might've been the closest to accurate, but I didn't check that aspect rigorously. I also only checked this using one color of note on one weapon, so for all I know this only applies to Ragnarok and other weapons scale more coherently.

HP Values, Etc.

These are all coming from the battle arena area (accessed from the Hillbert Hotel elevator; code: 888 688.)

Terminology

I'm not sure what the official names for the various note types are, so this is the terminology I'll be using:

• Hold Note: Note with a followup chain of notes that can be collected by holding the Absorb button.
  
• Black Note: Any note that can't be collected.
  
• Wide Note: The horizontal bars.

Organization

Enemies are organized as they are in the battle arena, to make it easy to find specific ones. You should be able to Ctrl+F and search for enemies by name as they're listed in the achievements, to make it easy to find the ones you need.

What about the other achievements?

The following enemies can't be re-fought after passing them in the story, from what I can find:

• Raven part 1
  
• Chase Anxious

If you need one or both of those, you're stuck replaying the game, unfortunately.

Right side - 1-5 - Furries

Hyena - 2000 HP Achievement: One hit kill Hyena Only uses Green and Blue Weak to neither; green is much easier to use.
Shark - 3200 HP Achievement: One hit kill Shark Mutant Uses Green and Brown Weak to neither; Green is more plentiful Section 1: Stay in lane 2, collect green, jump brown Section 2: Move between lane 1 and 2; stay in 1 unless moving to 2 to collect green Transition back to section (black notes): Stay in lane 2; jump one black note Will probably take multiple loops through the song to get enough notes to one-shot.
Insect Amalgamation - 1400 HP Achievement: One hit kill Insect Amalgamation Uses Red, Blue, Green, Yellow Weak to none; Easy with any Easy one-shot: Wait for greens or yellows and use them. You get enough very quickly.
Fuego - 4000 HP Achievement: One hit kill Fuego Uses Blue, Green, Red Weak to Red; Red is easiest Wait for the third section (red hold notes); easy to one-shot Be aware that there's a single long purple note in the middle of this section (center 3 lanes).
Dimension Master - 1364 HP Achievement: One hit kill Dimension Master Uses Green and Blue Weak to neither; Green is easiest Can kill very early in the fight with greens

Right Side - 6-11 - Aliens

Portal - 4000 HP Achievement: One hit kill Portal Uses Green, Blue, Red Weak to none; Blue is easiest Has many blue held notes
Lurker - 1900 HP Achievement: One hit kill Lurker Uses Brown, Green, Blue, Purple Weak to none; Brown easiest Short song; will need multiple loops. Aim to get 25-30 per loop. In section 2 (with all the colors), stay in the rightmost 2 lanes for an easier time.
Wheeler - 3888 HP Achievement: One hit kill Wheeler Uses Red, Blue, Green, Brown, Yellow Weak to Brown; Recommend using green Has 4 sections with subsets of colors in each; green is featured in #2 and #4. Edges are pretty easy to dodge other colors, but be aware of the wavy green notes in the middle. If you have trouble with the wavy notes, start collecting greens after those notes and you should have enough before seeing them again.
Thriller - 3000 HP Achievement: One hit kill Thriller Uses Blue, Brown, Red Weak to none; Recommend using Blue During the Red/Brown section, stay in lane 1 or 5 and focus on jumping colors and collecting wild notes. The Red/Brown section ends with a very difficult pattern of black notes. Movement required. If you struggle with the black note section, you can one-cycle it (from the beginning of the song or from immediately after the black note section), but it's tight.
World Eater - 2100 HP Achievement: One hit kill World Eater Uses Brown, Purple Weak to none; Use brown Very fast; less than 20 seconds. If you see purple notes, you've gone further than you need to.
Alien Warrior - 2400 HP Achievement: One hit kill Alien Monk Uses Purple, Yellow, Green, Blue Weak to Yellow; use yellow or blue Not difficult; recommend focusing on jumping rather than dodging.

Right Side - 12-21 - Vegetables

Red Onion - 1900 HP Achievement: One hit kill Red Onion Uses Green, Blue, Red Weak to Green and Red; Use Green
Broccoli - 1700 HP Achievement: One hit kill Brocoli Uses Brown, Blue Weak to Brown; Use either
Leek - 1900 HP Achievement: One hit kill Leek Uses Green and Purple Weak to Purple; Use either
Tomatoes - 2100 HP Achievement: One hit kill Tomatoes Uses Brown, Red, Blue Weak to Red; Recommend using Red
Melon - 2800 HP Achievement: One hit kill Melon Uses Green, Red, Blue Weak to Red; Recommend using Green If you're very good at catching wavy notes, use Red.
Chili - 2600 HP Achievement: One hit kill Chili Uses Yellow, Purple, Green Weak to Yellow; Recommend yellow Fight is very chill until you damage it; gets much harder once you do.
Bell Pepper - 1900 HP (Armored) Achievement: One hit kill Bell pepper Uses Blue Weak to none; use Blue (obviously)
Capsicum - 1700 (Armored) HP Achievement: One hit kill Capsicum Uses Purple Weak to none; use Purple (obviously)
Carrot Mage - 1200 HP Achievement: One hit kill Carrot Uses Purple, Red, Yellow, Blue Weak to Red; Use Purple Focus on dodging during the multi-colored phase, and the black note phase. For the black notes, stay in the 5th lane, jumping to 4th and back again as needed.
Juice Master No. 4671 - 3800 HP Achievement: One hit kill Juice Master Uses Green, Red, Blue Weak to Red; use Green Has some intimidating sections but they're not as bad as they look initially If you're good at catching wavy notes, you might have luck using Red. If you struggle with the wavy notes, start collecting Green after they end (while the boss stomps) and you'll have plenty before the wavy notes come back (if your damage is similar to mine).

Right Side - 22-26 - Mushrooms

Brown Slow Mushroom - 2500 HP Achievement: One hit kill Brown Slow Mushroom Uses Yellow, Brown, Blue, Green Weak to Green; Use whatever's easiest for you. Yellow is the hardest to dodge, but there aren't many of them. Lane 2 is easy during the blue / green / wild note section.
Beige Mushroom - 1800 HP Achievement: One hit kill Hydra Mushroom Uses Blue, Green, Brown Weak to Brown; Use Brown A short time into the fight, it'll go ballistic and create a lot of wild and brown notes. Hitting it during this period will set it back to the first pattern; if going for the one-shot, just collect the brown notes at that time, but beware of the wavy notes it'll periodically use. Lane 5 is fairly safe.
Smelly Gas Mushroom - 2100 HP Achievement: One hit kill Smelly Gas Mushroom Uses Blue, Yellow Weak to Yellow; Use Yellow When hit, it releases gas that obscures the playfield.
Sun Knight - 5000 HP (Armored) Achievement: One hit kill SunKnight MB Uses Blue, Brown Weak to none; Use Brown Should be easy due to long strings of brown notes; very easy to accidentally absorb a blue.
Divine Mushroom - ???? HP Achievement: None Uses Blue, Yellow, Red, Brown, Purple Weak to None Try to stay near the middle to avoid getting caught by hard to see notes. No damage needed; fight ends when the song ends (at 3:16:874)

Right Side - 27-29 - 3D

Evil Thought - 3350 HP Achievement: One hit kill M. Evil Thought Uses Blue, Yellow, Brown, Green Weak to Yellow, Use Z Hitting him causes the playfield to change position slightly.
3D Protector - 4500 HP Achievement: One hit kill Vanguard 3D Uses Brown, Green Weak to Brown; use Brown There's a string of browns every time he slams the hammer. Every time he slams the ground, the viewing angle changes; makes timing jumps difficult sometimes. Otherwise very easy.
Doopy Dragon - 3000 HP Achievement: One hit kill Doopy Dragon 3D Uses Green, Blue, Red Weak to Green; use Blue or Red AKA Doopy Draogn (as it's called in the battle arena area)

Right Side - 30-35 - Death Mountain

Rock - 2000 HP (Armored) Achievement: One hit kill Rock Uses Brown, Yellow, Purple Weak to none; Use brown
Mimic Chest - 1900 HP Achievement: One hit kill Mimic Chest Uses Yellow, Green, Red Weak to Green; Use Green Stick around lane 5 for an easy time.
Mimic Apple - 2200 HP Achievement: One hit kill Mimic Apple Uses Red, Blue Weak to Red; use Red
M8 Machine - 5000 HP Achievement: One hit kill Crab Machine Uses Red, Blue, Green Weak to None, Use Red Be aggressive; aim for 45 reds before the blue notes appear. Make your attack when the green notes appear. If you get hit, restart the song, rather than looping it. The only red notes are in the beginning, but there's enough to one-shot it comfortably in one cycle.
Zombie - 850 HP Achievement: One hit kill Zombie Islandier Uses Brown, Green Weak to none; Green is probably easier. Timed battle; if you take too long, you die. Timing is very tight for one-shot. If using green, focus on collecting wild notes before greens show up. Be very aggressive about going after notes.
Harpy - 1950 HP Achievement: One hit kill Harpy Uses Brown Weak to None; Use Brown Lots of black notes

Right Side - 36-38 - Yellow, Cursed Castle & Toilet

Yellow - 4200 HP Achievement: One hit kill Yellow Uses Red, Yellow, Green Weak to none; use Blue Easier than it seems. Wait for the section with the wavy notes and held blue notes, and start collecting blue. Keep them until after the long strings of wild notes just before the song loops, and you'll have plenty to one-shot.
Cursed Castle - 5000 HP Achievement: One hit kill Cursed Castle Uses Purple, Yellow Weak to none; Yellows are more plentiful, Purples are easier to absorb Purple is probably easier overall.
Toilet - 23331 HP Achievement: One hit kill Toilets Uses Blue, Yellow, Green, Red Weak to none; use whatever If going for the one-shot, it doesn't affect the achievement if it rolls 777 naturally - you just can't hit it to reset the slots, so you have to let it do so naturally. To get the one-shot achievement, you don't have to deal the last hit, as long as you hit it exactly 1 time during the fight (and let it roll 777 naturally repeatedly to damage itself). If not going for one-shot, just hit it any time you get anything other than 777. When you do get it, it will take 7777 damage.

Right Side - 39-41 - Slimes

Molly - 4000 HP Achievement: One hit kill Molly Uses Red, Green, Blue Weak to Blue; Use Blue Very difficult to one-shot.
DMITRI - 3700 HP Achievement: One hit kill Dmitri Uses Green, Purple, Blue, Red Weak to None; Purple isn't too bad to use. HP drops to 2700 as soon as the fight starts. (This may have been a bug and seems to have been fixed?) Many black notes
Lucy - 4444 HP Achievement: One hit kill Lucy Uses Blue, Yellow, Purple, Red, Brown Weak to None; recommend using Blue or Red, YMMV If good at catching wavy notes, yellow might be easier. Has long periods where only one or two colors are present. Red is probably easiest; you'll need to loop the song at least once, maybe twice if you're not aggressive enough. Switch weapons and focus on not getting hit in the blue / yellow section.

Right Side - 42-44 - Dragon

NOTE: If you are trying to get the one-shot achievements for these, you can fight each phase individually in the battle arena.

Dragon Phase 1 - 6000 HP Achievement: One hit kill Dragon part 1 Uses Blue, Purple, Green, Red Weak to Purple; Use Purple Has long periods where some colors are absent. Very difficult to one-shot due to high health.
Dragon Phase 2 - 4000 HP Achievement: One hit kill Dragon part 2 Uses Blue, Brown, Green, Red, Purple Weak to Purple; Use Purple Can be one-shot in a single cycle using purple.
Dragon Phase 3 - 6000 HP Achievement: One hit kill Dragon part 3 Uses Green, Red, Blue, Purple Weak to Purple; Use Purple

Right Side - 45-55 - Endgame

Bobo - 8333 HP Achievement: One hit kill Jester God Uses Red, Blue, Green Weak to Green Originally posted by BluePixel : So. Apparently, by hitting Bobo the Jester once, and then letting the battle reach the scripted end, you can easily get the One Hit KO achiviement for him. You're welcome.
Light Being - 4500 HP Achievement: One hit kill Light Being Uses Green, Blue Weak to None; Use Green This one is much easier than it looks. The song loop is very short. Beware the segments where you're involuntarily moved left/right. For the glitched movement sections, don't move until after the glitches. They always send you to the same lane regardless of where you start, so if you try to move while it's happening, it may result in getting hit. After the second glitched move, start moving again to avoid the notes. For the section with the green tall notes and the black notes, start in lane 2, jump the black notes and absorb the greens. Half way through the section, start moving between lane 1 and 2 to absorb green notes. The section is very easy with this method. Originally posted by Kanpachi : It seems using green and getting as many as possible early usually means after the first and second "glitch" movement, so long as you grab the wavy green notes in between, you can finish the one shot for it
For Loop - 5200 HP Achievement: One hit kill For Loop Uses Green, Blue, Yellow Weak to none Armored while stuck in the short loops. Make sure to wait until after the loop to attack. Loops can be used to gain a lot of notes of a single color.
Root of all evil - 7000 HP Achievement: One hit kill root of all evil Uses Blue, Green, Red Weak to none Originally posted by Kanpachi : If you grab a ton of early blue notes (I've found between 78-82 notes to be average) you can end the fight before it becomes unbearable Originally posted by Doblous : You should also recommend equipping the red bandanna for this one. It is a lifesaver.
Scary Shade - ???? HP (Somewhere between 2527 and 2653) Achievement: One hit kill Scary Shade Uses Green, Blue, Red Weak to Red It's possible to one-shot him from only the wavy blue notes, if you collect enough. (40-42 confirmed to work with level 4 weapon.)
Party Shade - 6666 HP Achievement: One hit kill Shade Post credits Uses Green, Red, Blue Weak to none Originally posted by Kanpachi : f you grab as many red notes early, then weapon swap for the part where there are red holds and blue walls, you can usually get enough notes by the time you get to the phase with omni-notes and green holds to one shot him
Evren - 4500 HP Achievement: One hit kill Evren Uses Red, Yellow, Green Weak to Yellow; Use Yellow or Red Red held notes or yellow singles are both easy.
Riley's Harpy - 3500 HP Achievement: One hit kill Riley's Harpy Uses Green, Red, Blue Weak to Red
Riley - 8882 HP Achievement: One hit kill Riley (Hidden) Uses Green, Blue, Red Weak to Red
End of TIme - 5000 HP Achievement: One hit kill Black Hole Uses Blue, Green Weak to None Most notes are Wild Originally posted by BluePixel : Easy way to get the One Hit Ko for end of time is to do it during the story, by reaching the checkpoint, dying and then oneshot it during the final attack. Again, you're welcome.
Judge Creation - 6000 HP Uses Green, Red, Blue Weak to None; Use Red Messes with the colors; use the icon to differentiate them. Use Red held notes for an easy win. Song is short; loop it as needed.

Right Side - 56-57 - Bonus Content

Many Mushrooms - 5500 HP (Approximate) Achievement: One hit kill Mushroom Party Uses Green, Purple, Orange, Yellow, Red Weak to None Healthbar increases, rather than decreases Will require multiple loops. Recommend using green; switch weapons during the red/yellow section. You can 1HKO on the second loop.

Cat God's Hairball - 10000 HP Achievement: One hit kill Cat God's hair ball Uses Red, Green, Brown, Purple, Blue, Yellow Weak to None; Recommend using Purple Switch weapons during the tall note sections. During the 'stretched' section, stay in lane 1 , switch weapons, and just absorb everything. The held note section after the stretched section is the best place to absorb notes - you can easily get 55-60 in one loop through this. If you're not confident about the rest of the song, collect notes here, then switch weapons for the rest of the song and wait for it to loop.

Left Side - 1-6 - Neons

Springhead - 1500 HP Achievement: One hit kill Spring Head Uses Red, Green Weak to Red; Use Red
Neon String - 2300 HP Achievement: One hit kill Neon String Uses Red, Green Weak to Red; Use Red Much easier if you're good at catching wavy notes.
Dark Piranha - 950 HP (Armored) Achievement: One hit kill Dark Piranha Uses Blue, Green Weak to None; Use either Abundance of hold notes makes Green easy to absorb.
Homunculus - 2000 HP Achievement: One hit kill Homunculus Uses Purple, Green Weak to Green; Use Green
Homunculus Cowgirl - 1650 HP Achievement: One hit kill Homunculus Yehaw Uses Green, Blue Weak to Green; Use Green If you have trouble dodging the blue section, use blue instead - it'll be easier, but will take far longer.
The Abyss - ???? HP Achievement: One hit kill Shaman Uses Brown, Blue, Purple Weak to none No damage needed; fight ends at 2:45:733 automatically. To get the one-hit-kill achievement, you must hit the boss exactly once during the fight, then let it end naturally.

Left Side - 7-10 - Forest

Yellow Toad - 2000 HP Achievement: One hit kill Frog Uses Blue, Green Weak to Green; Use Green The white bubbles hurt you. Since you aren't yourself for this fight, you have no weapons equipped and levels don't seem to matter. You'll likely do far less damage than you're expecting. 47 notes was enough to one-shot it.
Rasputin - 3800 HP Achievement: One hit kill Rasputin Uses Brown, Blue, Yellow, Red, Green Weak to Brown; Use Red Red is the best option due to chained notes in the last phase of the fight.
Intoxicated Bobo - 3200 HP Achievement: One hit kill Bobo intoxicated Uses Green, Red, Blue, Brown Weak to None; Recommend using Red During the section with the blue 'lasers', stay in lane 5 and jump the notes that come. During the section near the end with the brown notes and wide green notes, the brown notes have no collision; you can just stand in them and you won't get hit.
Squirrels - Around 3000-4000 HP Achievement: One hit kill Squirrels Uses Green, Purple, Brown Weak to None; Recommend Green Charging squirrels count as brown notes 4745 damage was enough to one-shot; 2985 was not.

Left Side - 11-14 - Cazok

Cazok's Carrot - 1700 HP Achievement: One hit kill Carrot Omega Uses Purple, Red, Yellow Weak to Red; use Yellow Has many chained yellow notes that make it a very quick one-shot.
Cazok's Vapor Entity - 2500 HP Achievement: One hit kill Ghost Omega Uses Purple Weak to Purple; use Purple
Cazok's Time Protector - 2600 HP Achievement: One hit kill Vanguard Omega Uses Brown Weak to Brown; use Brown Easy to collect brown with the chained notes.
Cazok - 5500 HP Achievement: One hit kill Cazok Uses Purple, Yellow, Blue, Green Weak to None; Use Purple or Yellow I found yellow to be easiest, but YMMV

Left Side - 15-17 - Ghosts

Chunky - 2800 HP Achievement: One hit kill Chunky Ghost Uses Purple Weak to Purple During the waves of black notes, stay on the left side.
Junkie - 2800 HP Achievement: One hit kill Junkie Ghost Uses Purple, Blue Weak to Purple; Use Purple During the waves of blue notes, stay on the left side.
Frankie - 3000 HP Achievement: One hit kill Frankie Ghost Uses Purple, Green Weak to Purple; Use Purple

Left Side - 18-35 - Computer

Motherboard INT - 2300 HP Achievement: One hit kill Motherboard INT Uses Red, Blue Weak to Red
RAM INT - 2400 HP Achievement: One hit kill RAM INT Uses Red, Green, Blue Weak to Red
Processor INT - 2100 HP Achievement: One hit kill Processor INT Uses Blue, Red Weak to Red; Use Blue
Motherboard BOOL - 2300 HP Achievement: One hit kill Motherboard Bool Uses Blue, Yellow Weak to None; Use Yellow
RAM BOOL - 2400 HP Achievement: One hit kill RAM Bool Uses Blue, Yellow Weak to None; Use Yellow
Processor BOOL - 2100 HP Achievement: One hit kill Processor Bool Uses Blue, Yellow Weak to None
Motherboard Char - 2300 HP Achievement: One hit kill Motherboard Char Uses Red, Purple, Green Weak to Green; Use Any
RAM Char - 2400 HP Achievement: One hit kill RAM Char Uses Red, Green Weak to Green
Processor Char - 2100 HP Achievement: One hit kill Processor Char Uses Purple, Green, Red Weak to Green
Motherboard While() - 2300 HP Achievement: One hit kill Motherboard While Uses Green, Yellow, Purple, Blue Weak to None; Use Blue
RAM While() - 2400 HP Achievement: One hit kill RAM While Uses Green, Blue, Yellow Weak to None; Use Blue
Processor While() - 2100 HP Achievement: One hit kill Processor While Uses Green, Blue, Yellow, Blue Weak to None; Recommend using Blue
Motherboard Float() - 2300 HP Achievement: One hit kill Motherboard Float Uses Red, Blue, Green Weak to Blue; Use Blue
RAM Float() - 2400 HP Achievement: One hit kill RAM Float Uses Red, Blue Weak to Blue
Processor Float() - 2100 HP Achievement: One hit kill Processor Float Uses Blue, Purple, Red Weak to Blue
Hostile Dimension Rift - 3600 HP Achievement: One hit kill Matrix Uses Red, Blue, Purple Weak to Purple; Use Blue
Processor Firewall - 3600 HP (Armored) Achievement: One hit kill Processor Gate Uses Blue, Green, Purple Weak to None; Recommend Purple due to held notes; YMMV
Processor Barrage - 1900 + 1900 HP Achievement: One hit kill Barrage Bool Achievement: One hit kill Barrage INT This is two fights in one; first one: Uses Green, Blue, Red Weak to None; Recommend using Red due to held notes Second one: Uses Yellow, Blue Weak to None; Use either

Left Side - 36-40 - Misc.

Stonegrunt - 2400 HP Achievement: One hit kill Stoneguard Grunt Uses Green, Blue Weak to Green; Use Either Green does more damage; Blue is more plentiful.
Corrupt Irvine - 4500 HP Achievement: One hit kill Irvine Corrupt Uses Green, Red, Blue, Yellow, Purple Weak to Green, Purple
Raven second Tutorial - 220 HP Achievement: One hit kill Raven part 2 Uses Red, Blue, Green Weak to None; Use any
Chase - 1900 HP (Armored) Achievement: One hit kill Chameleon Uses Green, Blue Weak to None; Use either 'Chase Anxious' is the achievement for the OHK the first time Chase is encountered in the story; this doesn't appear to have a way to re-fight.
Jean D' Arc - 3950 HP (Armored) Achievement: One hit kill Joan The Arc Uses Blue, Green, Yellow Weak to None; Use Green or Blue

Left Side - 41-48 - Boatman

Tutorial Void Zombie - 4000 HP Achievement: One hit kill Void Zombie Uses Yellow, Purple, Red, Green, Blue, Brown Weak to None; Use Red Easy to one-shot if you wait til the barrage of wild notes near the end; collect the wilds and a few reds in that section, and you'll have far more than enough.
Tutorial Primal Jester - 4500 HP Achievement: One hit kill Jester Face Uses Yellow, Brown, Green, Blue Weak to None; Use Brown The waves of Brown held notes midway through the song make for a very easy one-shot.
Tutorial Gnome - 2800 HP Achievement: One hit kill Red Gnome Uses Blue, Purple, Green, Red, Brown Weak to None; Use Blue or Purple The blue / purple balls make for an easy one-shot.
Tutorial Void Zombie Climax - 3500 HP Achievement: One hit kill Void Zombie Climax Uses Red, Blue, Yellow, Purple, Brown Weak to None; Use Red Easy to one-shot with the tall red notes.
Finale Void Zombie - 1500 HP Achievement: One hit kill Void Zombie Final Uses Blue, Green, Brown Weak to Brown; Use Any Low hp; choose whatever color you're most comfortable with.
Void Jellyfish - 4000 HP Achievement: One hit kill Void Jellyfish Final Uses Red, Green, Blue Weak to None; Use Red The Red hold notes make this one very easy to one-shot.
Final Primordial Jester - 5000 HP Achievement: One hit kill Jester Face Final Uses Green, Brown, Yellow, Purple Weak to None; Use Purple Collect wild notes during the initial Green section, then switch to Purple to close it out.
Lost Spirit - 3500 HP Achievement: One hit kill Lost Spirit Final Uses Green, Red, Blue Weak to None; Use Red or Blue There's long strings of red and blue held notes shortly into the song; these make it very easy to one-shot.

Credits

The following folks provided new info or confirmed existing info:
- Spockus (Scary Shade HP)
- natcher1609 (Confirmed Shaman one-hit requirements)
- Freezing Iris (Scary Shade HP)
- IHasChins (Scary Shade one-hit tips)
- Phantom (Damage scaling research)
- BluePixel (Bobo tips)
- loudaslife (Confirming Toilet one-shot mechanics)
- Kanpachi (Three Endgame strategies)
- Driftwoodmfb (Root of all evil HP)
- Mist (Scary Shade HP)
- BX (Further narrowing of Root of all evil's HP)
- Doblous (Root of all evil HP, Tips)

Thanks!

[Zebefreo]

Edit: I can confirm Riley has less than 8888hp on colisseum. I hit him with 6334 damage and he went down. I used katana + the beads.

[Zebefreo]

I'm not 100% sure, but it seems like riley's hp are lower than 8888 since the fight ends when he's near 1200 HP.

[Kobold Anti-Gnome Alliance]

Yeah, all of the listed HP values are specifically for the Colosseum, since I figure that's where most folks are going to be trying to get the one-shot achievements. They definitely vary for the story.

7000 does seem to match with what we'd gathered for the Colosseum version - I'll update the value! Thanks for the data!

[Dobious]

Just so you know, Root of all evil in the Colosseum has 7000 HP and i hear the one at the start has 1800 HP.

You should also recommend equipping the red bandanna for this one. I missed it and the fight took me literal hours to do. Had to get the save file from a person who had the bandanna just to scratch by. It is a lifesaver.

Also I'd give a fair warning against trying the 1800 Hp Root of all Evil cause Raven will save you before you have time to absorb enough attacks.

[Kanpachi]

oh wow you weren't lying you hit just about everything you'd need to know

[Kobold Anti-Gnome Alliance]

Way ahead of you; it's in the Right Side -> Bonus Content section. ;)

[Kanpachi]

For the harder new battle (idk if I should be worried bout spoiling here) best bet is purple, and it has 8000 hp in the normal battle and 10000 hp for the refight; weapon swapping is required by the seems of it

[Kobold Anti-Gnome Alliance]

I do, in fact! Thanks for the heads up!

[Link_Z]

They've added 2 new enemies, in case you wanna update the guide!

[Kobold Anti-Gnome Alliance]

Thanks for the info! Updated the HP range for it.