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Bosses

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Bosses
Chapter 1 Chapter 2 Chapter 3 Chapter 4 Added in Afterbirth  Blue Womb Chapter 5 Chapter 6 Added in Afterbirth †  The Void
Universal Devil and Angel Room Seven Deadly Sins Added in Afterbirth  Greed Mode All Mini-Bosses All Bosses

Bosses are very strong monsters found in boss rooms at the end of a floor. The boss at the end of the floor must be defeated in order to advance to the next floor. In later chapters, bosses are able to spawn as normal enemies. This starts in the caves, where the Gurglings are often encountered. The boss for a particular floor is chosen from the pool of bosses for the Chapters of the floor. Bosses may also spawn as champions, which can change various attributes such as health, damage, and attack pattern. Upon defeat, most bosses will drop an item from the boss item pool.

Bosses boast additional resistances to Status Effects. For example, fear occurs less often and the Added in AfterbirthNight Light Night LightNight Light Icon.pngA cone of light shines in the direction Isaac is moving that slows enemies and enemy shots. is unable to slow them down.

Additionally, some floors may spawn a room with a Mini-boss.

In total, there are 72 bosses and 18 mini-bosses. 10 bosses were added in Afterbirth and 6 were added in Afterbirth †.

Trivia

  • Originally every boss and enemy in Isaac was going to resemble Isaac in some way. [1] This is still the case for some.
  • Double Trouble boss pools can have bosses from previous chapters, and can be the same for both versions of that chapter's floor. This means that, for example, Double Trouble boss fights in the Caves can feature bosses from the Cellar or the Basement, and every Double Trouble fight in the Caves can also be encountered in the Catacombs.
  • Bosses often come in three versions: normal (For example, Monstro), posthumous (Monstro II), and alternate (Gish). Usually, the posthumous boss looks like the original with some horrible mutilation; for example, Monstro and Chub had most of their skin ripped off.
    • Most bosses and their alternate/posthumous forms either share similar death animations or share the fact that they lack death animations.
  • Some bosses appear as evolved or larger versions of enemies. (For example, Chub looks like a bigger Charger) Some even act as larger versions of other bosses. (Little HornAdded in Afterbirth and Big HornAdded in Afterbirth †)

Bugs

Bug Bug! Defeating a boss quickly enough might cause the boss music to play, even after the boss dies.


Bosses Boss Monstro.png
Chapter 1
Stage basement.png
Stage cellar.png
Stage burning basement.png
Blighted OvumDingleThe Duke of FliesFamineFistulaGeminiGurglingsThe HauntLarry Jr.MonstroPinStevenWidow
Added in Afterbirth DangleLittle HornRag ManTurdlings
Chapter 2
Stage caves.png
Stage catacombs.png
Stage flooded caves.png
Carrion QueenC.H.A.D.ChubDark OneGurdyGurdy Jr.The HollowThe HuskMega FattyMega MawPeepPestilencePolycephalusThe Wretched
Added in Afterbirth The ForsakenThe FrailThe Stain
Added in Afterbirth † Big HornRag Mega
Chapter 3
Stage depths.png
Stage necropolis.png
Stage dank depths.png
The AdversaryThe BloatThe CageThe GateGishLokiMask Of InfamyMonstro IIWarMom
Added in Afterbirth Brownie
Added in Afterbirth † Sisters Vis
Chapter 4
Stage womb.png
Stage utero.png
Stage scarred womb.png
BlastocystThe BloatConquestDaddy Long LegsDeathLokiiMama GurdyMr. FredScolexTeratomaTriachnidMom's HeartIt Lives
Added in Afterbirth † Sisters VisThe Matriarch
Added in Afterbirth Blue Womb
???
Added in Afterbirth Hush
Chapter 5
Stage sheol.png
Stage cathedral.png
SatanIsaac
Chapter 6
Stage dark room.png
Stage chest.png
???The LambMega Satan
Added in Afterbirth Greed Mode
Ultra Greed
Added in Afterbirth Ultra Greed
Added in Afterbirth † Ultra Greedier
Added in Afterbirth † The Void
Stage the void.png
Added in Afterbirth † Delirium
Chapters 1-4 The FallenThe Headless Horseman
The Binding of Isaac: Rebirth The Binding of Isaac: Rebirth The Binding of Isaac: Rebirth
Achievements Achievements Attributes Attributes Bosses Bosses TarotCard.png Cards and Runes Challenges Challenges Chapters Chapters
Characters Characters MainPageBabies.png Co-op Items Items Item Pools Item Pools Monsters Monsters Objects Objects
Pickups Pickups Pills Pills Rooms Rooms Seeds Seeds Transformations Transformations Trinkets Trinkets