Slaughtermill Boss 4 of 10 · Vale of Wrath
- Health
- 3,250
- Catalyst reward
- 30,000
- Unblockable attacks
- 0
- Methodology
- Data Methodology
- Author
- Dakota Chinnick
Slaughtermill is boss 4 of 10 in Valor Mortis, fought in Vale of Wrath (Chapter V Crime). It has 3,250 HP across 3 phases, uses 0 attacks of which none are unblockable, and is weak to nothing in particular. Defeating it awards 30,000 Catalysts.
- Health
- 3,250#5 of 10 bosses by HP
- Location
- Vale of WrathChapter V Crime
- Catalyst reward
- 30,000 CatalystsPaid out on the kill screen
- Unblockable attacks
- 0Every attack can be blocked
- Weak to
- nothing in particular
- Nearest Lantern
- Old WindmillAbout 136 m from the fight
How to beat Slaughtermill
Strategy built from the boss's data: which attacks to dodge, what it is weak to and how to open it up.
Slaughtermill is not a duel: the windmill never swings at you directly. It spawns Carrion slimes, some of them burning, and hurls corpses, across three phases and 3,250 HP. Kill the slimes as they arrive, keep moving to avoid the thrown corpses, and spend the gaps damaging the mill.
It has no posture bar, no Stasis segments and no resistances, so there is no critical-attack opening and every weapon deals full damage. Fire Transmutation and Blunderbuss blasts are good for clearing slime packs. The kill pays 30,000 Catalysts, more than its own Catalyst value.
- None of its attacks are flagged unblockable, so a raised guard or a well-timed parry handles everything it throws.
- It has no posture bar, so there is no critical-attack opening: the fight is a pure damage race.
- The nearest Lantern is Old Windmill, about 136 m from the fight, where you respawn after a death.
Recommended build for Slaughtermill
CalculatedWeapons, statuses, Ambers and Transmutations that fit this fight, from Slaughtermill's resistances and the hits-to-kill maths.
- Fewest blade hits (level 10)
- Claymore: 33Body hits, before upgrades and Ambers
- Fewest firearm shots (level 10)
- Blunderbuss: 10Body hits, before upgrades and Ambers
- Fire damage taken
- ×1
- Ignite build-up resistance
- 0%
- Stasis
- Cannot be frozen
- Posture → critical
- No posture bar
Slaughtermill has 3,250 HP, no posture bar, no Stasis segments and no resistances, so there is nothing to break or freeze: this fight is raw damage plus crowd control. Its phases change at 2,251 and 751 HP.
The Musket, found in this region (the Vale of Wrath), is the efficient damage dealer: 22 shots at level 1 and 11 at level 10, against 163 Saber light hits at level 1. The slimes it spawns are Carrion: regular ones take double fire damage, but the burning variants resist 80 to 90% of fire, so burn the plain ones with the Fire Transmutation and blast the burning ones with the Blunderbuss (up to 150 damage per point-blank shot at level 1, with a 0.7 s stagger).
Warrior's Fury (+10 to 30% damage and extra speed for 8 s after each kill) pays off on the constant slime kills, and Surplus adds 10 to 15% Catalysts per kill. The kill itself pays 30,000 Catalysts.
Slaughtermill attacks and moves
Game dataSlaughtermill does not strike you directly; the danger comes from what it summons and throws.
- Boss Windmill Spawn Slimes Normal · Summon
- Boss Windmill Spawn Slimes Fire · Summon
- Boss Windmill Corpse Throw · Projectile
Weaknesses and resistances
Game dataSlaughtermill has no damage-type weaknesses or resistances: every weapon deals its full damage.
Red = takes extra damage of that type; filled to the right = resists it (100% = immune).
Slaughtermill's phases
Game dataWhen each phase starts and what changes: the posture pool and the resistances each phase record sets.
| Phase | Starts | Posture | Resistance changes |
|---|---|---|---|
| Phase 1 | Fight start | — | Same as base |
| Phase 2 | Below 2,251 HP | — | Same as base |
| Phase 3 | Below 751 HP | — | Same as base |
HP thresholds are shown only where the phase record holds an absolute health value below the boss's maximum; other phases change on a scripted trigger, so no number is printed. Resistance changes compare the phase record's overrides with the base profile in the Resistances section.
Slaughtermill stats
Game dataHealth, posture and reward compared with the other bosses.
- Health
- 3,250#5 of 10
- Catalyst reward
- 30,000 Catalysts
Data: Steam build 25907482 (1.0 launch). How we source this
Where to find Slaughtermill
Slaughtermill is fought in Vale of Wrath during Chapter V Crime. The closest Lantern is Old Windmill.
- Location: Vale of Wrath
- Chapter: Chapter V Crime
- Nearest Lantern: Old Windmill · about 136 m away
- Open the Vale of Wrath map
Everything placed in Vale of Wrath
Ability altars: 3
Bosses: 2 (Slaughtermill)
Boss arenas: 1
Chests: 19 (Butcher's Carnage, Pure Blade Material, Lucky Shot, Exquisite Firearm Parts, Perfectionism, Distilled Transmutation Material, Superior Firearm Parts, Empty Ferrofluid Flask, Wound that Heals, Distilled Blade Material, Pure Transmutation Material, Ferrofluid Flask Power Upgrade, Dilated Moment)
Keys: 1 (Basement Key)
Lanterns: 5 (Ship Graveyard, Under the Bridge, Poisoned Camp, Old Windmill, Wolfsbane Field)
Letters: 23 (Mirek's Note, Shrike's Appeal — Join the Resistance, Deserter's Friend Diary, Wolf's Note — Poison, Cryptic Note — Wolf, Wanted Notice, Shrike's Appeal, Medic's Letter, Shrike's Order — Cargo, Painter's Final Letter, Headquarters' Orders — New Troops, Beekeeper's Note, Captain Lefèvre's Letter — New Troops, Shrike's Appeal — Informants, Thief's Note — Loot, Thief's Note — Warning, Emissary's Letter, Headquarters' Orders — Poisoned Troops, Shrike's Orders — Cargo, Rebel's Note — Mistake, Cargo Manifest, Toothless Jack's Journal, Deserter's Diary)
Journal entry
Game dataSpoilerRead William's journal entry on Slaughtermill
The Slaughtermill was once a windmill, now animated by the plague into a monument of execution and betrayal. French officers were lured there under false pretences and slaughtered without the chance to defend themselves.
The creature seems shaped by those final moments. Rotating blades grind endlessly like the machinery of execution, while distant screams echo from within its frame. It is as though the plague absorbed every emotion tied to that place — terror, betrayal, helplessness — and forged them into something living.
Slaughtermill is the boss of Vale of Wrath and boss number 4 of 10 in the campaign, with 3,250 HP. All 0 attacks can be blocked; the hardest single hit is — for —. No damage type gets a bonus against it. Beating it pays 30,000 Catalysts.
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Slaughtermill FAQ
How do you beat Slaughtermill in Valor Mortis?
Slaughtermill is not a duel: the windmill never swings at you directly. It spawns Carrion slimes, some of them burning, and hurls corpses, across three phases and 3,250 HP. Kill the slimes as they arrive, keep moving to avoid the thrown corpses, and spend the gaps damaging the mill. None of its attacks are flagged unblockable, so a raised guard or a well-timed parry handles everything it throws. It has no posture bar, so there is no critical-attack opening: the fight is a pure damage race. The nearest Lantern is Old Windmill, about 136 m from the fight, where you respawn after a death.
What is the best build for Slaughtermill in Valor Mortis?
Slaughtermill has 3,250 HP, no posture bar, no Stasis segments and no resistances, so there is nothing to break or freeze: this fight is raw damage plus crowd control. Its phases change at 2,251 and 751 HP. The Musket, found in this region (the Vale of Wrath), is the efficient damage dealer: 22 shots at level 1 and 11 at level 10, against 163 Saber light hits at level 1.
How much HP does Slaughtermill have?
Slaughtermill has 3,250 HP, #5 of the 10 bosses. Its posture pool is 0.
Where is Slaughtermill in Valor Mortis?
Slaughtermill is fought in Vale of Wrath during Chapter V Crime. The nearest Lantern is Old Windmill, about 136 m from the fight.
What is Slaughtermill weak to?
Slaughtermill has no damage-type weaknesses or resistances; every weapon deals full damage.
What do you get for beating Slaughtermill?
Defeating Slaughtermill awards 30,000 Catalysts. It also unlocks the Quixotry achievement.
How many phases does Slaughtermill have?
Slaughtermill fights in 3 phases, and its posture and attacks can change between them.
Which boss comes before Slaughtermill?
Slaughtermill is boss 4 of 10; the boss before it is Sphinx, Devourer of the Unworthy.