A boss every ten chambers.
Chambers 10–140 draw from five milestone bosses. The Owner waits at chamber 150. Bosses change their move set at half vitality. Their health and damage scale with depth and difficulty, so the moves below describe behavior rather than fixed damage. READ exposes upcoming moves and reactive tells.
From chamber 51, boss fights can have a second foe; from chamber 101, a third. The field holds up to three enemies.
Boss identities and second-phase moves follow. The final boss is hidden behind a spoiler disclosure.

The Clockwork Kennels
Brass Jackal
Element: Fire · Weak to Water (+20%)
Opening hand
- Raking Claw: Deals damage.
- Iron Hide: Raises enemy Guard.
- Gearbite: Breaks Guard.
- Piston Leap: Deals damage.
- Whistle for the Pack: Calls a companion; rallies a full field.
At half vitality
- Whistle for the Pack: Calls a companion; rallies a full field.
- Frenzied Claws: Deals damage.
- Overwound: Builds power for a following attack.
- Piston Leap: Deals damage.

The First Counting House
Gilded Maw
Element: Neutral · No elemental weakness or resistance
Opening hand
- Goldbite: Deals damage.
- House Tax: Damages you and takes coins.
- Vault Slam: Breaks Guard.
- Vault Door: Raises enemy Guard.
- Devour Fortune: Deals damage.
- Cook the Books: Makes the next spin more dangerous.
At half vitality
- Cook the Books: Makes the next spin more dangerous.
- Devour Fortune: Deals damage.
- Compound Interest: Damages you and takes coins.
- Count the Take: Restores enemy vitality.
- Goldbite: Deals damage.

The Enforcement Suite
Pit Boss
Element: Fire · Weak to Water (+20%)
Opening hand
- Velvet Rope: Raises enemy Guard.
- Chip Fists: Deals damage.
- Rope Slam: Breaks Guard.
- Restack: Restores enemy vitality.
- Overhand Break: Deals damage.
- Confiscate: Steals action charges.
At half vitality
- Confiscate: Steals action charges.
- Overhand Break: Deals damage.
- Rope Slam: Breaks Guard.
- Chip Fists: Deals damage.
- Cigar End: Inflicts burning damage.

The Machine Sanctum
One-Armed Bandit
Element: Electricity · Weak to Fire (+20%)
Opening hand
- Lever Pull: Builds power for a following attack.
- Coin Barrage: Deals damage.
- Eat the Purse: Damages you and takes coins.
- Cabinet Slam: Raises enemy Guard.
- Jackpot Burst: Deals damage.
- Fix the Reels: Makes the next spin more dangerous.
At half vitality
- Fix the Reels: Makes the next spin more dangerous.
- Jackpot Burst: Deals damage.
- Lever Pull: Builds power for a following attack.
- Triple Bar: Deals damage.
- Cabinet Drop: Breaks Guard.

The Bottomless Vault
Queen Of Coins
Element: Neutral · No elemental weakness or resistance
Opening hand
- Royal Ante: Raises enemy Guard.
- Scepter Fall: Deals damage.
- Royal Decree: Weakens your damage.
- All Debts Due: Damages you and takes coins.
- Stack the Odds: Builds power for a following attack.
- Crown's Verdict: Deals damage.
At half vitality
- Royal Decree: Weakens your damage.
- Crown's Verdict: Deals damage.
- Stack the Odds: Builds power for a following attack.
- Sovereign Claim: Steals action charges.
- Scepter Fall: Deals damage.
- Coin of the Realm: Restores enemy vitality.
Final chamber · reveal The Owner

The Owner's Table
The Owner
Element: Neutral · No elemental weakness or resistance
Opening hand
- Swelling Appetite: Builds power for a following attack.
- Treasure Eruption: Deals damage.
- Scaly Bulk: Raises enemy Guard.
- Grasping Tentacles: Deals damage.
At half vitality
- Crushing Grip: Breaks Guard.
- One More Mouthful: Builds power for a following attack.
- Everything Is Mine: Deals damage.
- Ravenous Lunge: Deals damage.