Experiment 83 Boss 7 of 10 · The Outskirts
- Health
- 3,400
- Posture
- 1,000
- Catalyst reward
- 20,000
- Unblockable attacks
- 2
- Methodology
- Data Methodology
- Author
- Dakota Chinnick
Experiment 83 is boss 7 of 10 in Valor Mortis, fought in The Outskirts (Chapter VII Witch Hunt). It has 3,400 HP across 1 phase, uses 4 attacks of which 2 are unblockable, and is weak to Fire damage. Defeating it awards 20,000 Catalysts.
- Health
- 3,400#4 of 10 bosses by HP
- Location
- The OutskirtsChapter VII Witch Hunt
- Catalyst reward
- 20,000 CatalystsPaid out on the kill screen
- Unblockable attacks
- 2Unfair Slam, Melee Grab
- Weak to
- Fire damage
- Nearest Lantern
- LighthouseAbout 35 m from the fight
How to beat Experiment 83
Strategy built from the boss's data: which attacks to dodge, what it is weak to and how to open it up.
Experiment 83 has few moves but one of the hardest hits in the game: the Unfair Slam deals 120 and cannot be blocked, so treat every slam wind-up as a signal to dodge. The Triple Swipe (50) and Rage flurry (45) can be blocked.
Its head takes 50% extra damage and its limbs only 80%, and it takes 20% extra from fire, so the Fire Transmutation and headshots are the efficient route through its 3,400 HP. Its posture pool is 1,000, but the reward is huge: a critical attack after a posture break deals 1,000 damage, almost a third of its health.
- Watch for the red attacks: Unfair Slam, Melee Grab cannot be blocked, so dodge them instead of holding block.
- Lean on Fire damage: it takes extra damage from it.
- Avoid relying on Ignite build-up; it resists that damage type.
- Its head takes ×1.5 damage, so aimed firearm shots to the head pay off.
- Its posture pool is 1,000. Break it with heavy and parried hits, then land a critical attack for a fixed 1,000 damage (29% of its HP).
- It has a grab: grabs cannot be blocked, so keep your distance when it lunges in.
- The nearest Lantern is Lighthouse, about 35 m from the fight, where you respawn after a death.
Recommended build for Experiment 83
CalculatedWeapons, statuses, Ambers and Transmutations that fit this fight, from Experiment 83's resistances and the hits-to-kill maths.
- Fewest blade hits (level 10)
- Claymore: 34Body hits, before upgrades and Ambers
- Fewest firearm shots (level 10)
- Blunderbuss: 107 to the head
- Fire damage taken
- ×1.2
- Ignite build-up resistance
- 50%
- Stasis
- 5 segments · 30% resistanceFull freeze breaks for 550 damage
- Posture → critical
- 1,000 → 1,000
Experiment 83 takes 20% extra fire damage and 1.5x damage to the head, but resists half of Ignite build-up and 30% of Stasis. Its critical attack is the big prize: 1,000 damage after breaking 1,000 posture, almost a third of its 3,400 HP. It shares its four-move kit and its 3,400 HP / 1,000 posture with the Abomination enemy's boss variant, so practising on Abominations is practising for this fight.
The two blockable moves (Triple Swipe 50, Rage 45) cost 60 Endurance to block, and the Unfair Slam (120) is the hardest red hit any boss lands: dodge every slam. Damage options: the Claymore needs 68 light hits at level 1 (the Saber 170), and the Musket 16 headshots at level 1 or 8 at level 10. The Fire Transmutation with Brittleness (Ignited enemies take 1.1x melee damage) uses its fire weakness.
Ambers: Dominatus turns that 1,000-damage critical into Health, Iron Grip stops a slam from interrupting your flask, and Wound that Heals regenerates between openings.
Experiment 83 attacks and moves
Game dataEvery attack Experiment 83 uses, grouped into combos, with damage per hit and whether you can block it.
Damage is the base value per hit (bosses always fight at level 1, so no level scaling applies). Move names marked * come from the game's internal tags, because the game never shows attack names.
Weaknesses and resistances
Game dataWeak to Fire damage (×1.2). Resists Ignite build-up (−50%).
Red = takes extra damage of that type; filled to the right = resists it (100% = immune).
Weak points
| Body part | Damage taken | Posture damage taken |
|---|---|---|
| Head | ×1.5 | ×1 |
| Chest | ×1 | ×1 |
| Groin | ×1 | ×1 |
| Hands | ×0.8 | ×1 |
| Legs | ×0.8 | ×1 |
Experiment 83 stats
Game dataHealth, posture and reward compared with the other bosses.
- Health
- 3,400#4 of 10
- Posture
- 1,000
- Critical attack damage
- 1,000Fixed damage of a critical attack after a posture break
- Stasis segments
- 5
- Hardest single hit
- 120 · Unfair Slam
- Catalyst reward
- 20,000 Catalysts
Data: Steam build 25907482 (1.0 launch). How we source this
How many hits to kill Experiment 83
CalculatedHits needed with each weapon's basic attack at weapon levels 1, 5 and 10, after the boss's resistances.
| Weapon | Weapon level 1 | Weapon level 5 | Weapon level 10 |
|---|---|---|---|
 Pistol | 11430 per hit76 to the head | 8142 per hit54 to the head | 5760 per hit38 to the head |
 Musket | 23150 per hit16 to the head | 17210 per hit11 to the head | 12300 per hit8 to the head |
 Blunderbuss | 23150 per hit16 to the head | 15230 per hit10 to the head | 10350 per hit7 to the head |
 Saber | 17020 per hit | 8540 per hit | 5760 per hit |
 Rapier | 13625 per hit | 9835 per hit | 7645 per hit |
 Claymore | 6850 per hit | 4380 per hit | 34100 per hit |
Basic light attacks (blades) or single shots (firearms; the Blunderbuss at point-blank range). Upgrades, Ambers, coatings, charged attacks and critical attacks all cut these numbers.
Where to find Experiment 83
Experiment 83 is fought in The Outskirts during Chapter VII Witch Hunt. The closest Lantern is Lighthouse.
- Location: The Outskirts
- Chapter: Chapter VII Witch Hunt
- Nearest Lantern: Lighthouse · about 35 m away
- Open the The Outskirts map
Everything placed in The Outskirts
Bosses: 3 (High Justicar Aurelius, Experiment 83)
Chests: 13 (Distilled Blade Material, Lunatic's Grasp, Empty Ferrofluid Flask, Distilled Transmutation Material, Butcher's Carnage, Ferrofluid Flask Power Upgrade, Dominatus, Glass Soldier, Surplus, Superior Firearm Parts, Imperial Catalyst Clot, Quintessential Blade Material)
Lanterns: 6 (Lighthouse, Harbour, Island of Whispers, Broken Bridge, Market Square, Breach)
Letters: 20 (Sick Child's Diary, Secret Goodbye, Medical Records — The Experiment, Sickroom Flyer, Cryptic Note, Mice Rules — Note Two, Mice Rules — Note Three, Mice Rules — Note One, Shrike's Appeal — Follow the Light, Old Lady's Diary, City Offensive — Rebels, Barnaby's Diary, City Offensive — Resistance, Shrike's Appeal — Napoleon, Note on Scruffy's Grave, Mice Rules — Note Four, Crusty Benek's Journal, A Torn Letter to Crusty Benek, Torn Page with Shrike's Anthem)
Rewards and achievement
Game dataWhat defeating Experiment 83 gives you.
- Catalyst reward: 20,000 Catalysts
Lament of the Limbs · 1.1% of Steam players · Defeat Experiment 83.
Experiment 83 is the boss of The Outskirts and boss number 7 of 10 in the campaign, with 3,400 HP. Of its 4 attacks, 2 are unblockable (Unfair Slam, Melee Grab); the hardest single hit is Unfair Slam for 120. It takes extra damage from Fire damage. Beating it pays 20,000 Catalysts.
See Also
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Experiment 83 FAQ
How do you beat Experiment 83 in Valor Mortis?
Experiment 83 has few moves but one of the hardest hits in the game: the Unfair Slam deals 120 and cannot be blocked, so treat every slam wind-up as a signal to dodge. The Triple Swipe (50) and Rage flurry (45) can be blocked. Its head takes 50% extra damage and its limbs only 80%, and it takes 20% extra from fire, so the Fire Transmutation and headshots are the efficient route through its 3,400 HP. Watch for the red attacks: Unfair Slam, Melee Grab cannot be blocked, so dodge them instead of holding block. Lean on Fire damage: it takes extra damage from it. Avoid relying on Ignite build-up; it resists that damage type.
What is the best build for Experiment 83 in Valor Mortis?
Experiment 83 takes 20% extra fire damage and 1.5x damage to the head, but resists half of Ignite build-up and 30% of Stasis. Its critical attack is the big prize: 1,000 damage after breaking 1,000 posture, almost a third of its 3,400 HP. It shares its four-move kit and its 3,400 HP / 1,000 posture with the Abomination enemy's boss variant, so practising on Abominations is practising for this fight.
How much HP does Experiment 83 have?
Experiment 83 has 3,400 HP, #4 of the 10 bosses. Its posture pool is 1,000.
Where is Experiment 83 in Valor Mortis?
Experiment 83 is fought in The Outskirts during Chapter VII Witch Hunt. The nearest Lantern is Lighthouse, about 35 m from the fight.
What is Experiment 83 weak to?
Weak to Fire damage (×1.2). Resists Ignite build-up (−50%).
What do you get for beating Experiment 83?
Defeating Experiment 83 awards 20,000 Catalysts. It also unlocks the Lament of the Limbs achievement.
Which attacks of Experiment 83 are unblockable?
2 attacks are unblockable: Unfair Slam, Melee Grab. Dodge these instead of blocking.
Which boss comes before Experiment 83?
Experiment 83 is boss 7 of 10; the boss before it is High Justicar Aurelius, Last of the Faithful.