Bosses

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Issues: Some bosses are missing their Repentance redesign.

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 to advance to the next floor. In later chapters, many of these non-final bosses can spawn as degraded bosses, or normal enemies. The same can go for mini-bosses, which can spawn on later floors as degraded mini-bosses. However, some bosses and mini-bosses may not appear as degraded bosses at all. The boss for a particular floor is chosen from the pool of bosses for the chapters of the floor. After defeating Satan for the first time, 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 as well as 1-2 Hearts of any kind.

Bosses boast additional resistances to status effects. Once a boss has been inflicted with a status, they become immune to further ones for some time, lasting longer than the initial effect itself. Slowdown-causing items that require the enemy to stay within their area such as Added in Afterbirth15►Night Light Night Light are nearly useless on bosses due to the immunity triggering from the first tick. On the other hand, whole-room slowdown and slowing creep, such as that from 15►Stop Watch Stop Watch and 15►Juicy Sack Juicy Sack, ignore the immunity and affect bosses like normal enemies.

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

In total, there are 102 bosses and 20 mini-bosses. 10 bosses were added in The Binding of Isaac: Afterbirth, 6 were added in The Binding of Isaac: Afterbirth †, and 30 bosses and 2 mini-bosses were added in The Binding of Isaac: Repentance.

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 Horn Added in Afterbirth and Big Horn Added in Afterbirth †).


Bosses Boss Monstro.png
Chapter 1
Stage Basement icon.pngStage Cellar icon.pngStage Burning Basement icon.png
GeminiStevenBlighted OvumDingleThe Duke of FliesFamineGurglingsThe HauntLarry Jr.MonstroPinWidowThe FallenThe Headless Horseman
DangleLittle HornRag ManTurdlings
Baby Plum
Chapter 1.5
Stage Downpour icon.pngStage Dross icon.png
Lil BlubWormwoodThe RainmakerMin-MinClogColostomiaTurdlet
Chapter 2
Stage Caves icon.pngStage Catacombs icon.pngStage Flooded Caves icon.png
FistulaChubC.H.A.D.Carrion QueenDark OneGurdyGurdy Jr.The HollowThe HuskMega FattyMega MawPeepPestilencePolycephalusThe WretchedThe FallenThe Headless Horseman
The ForsakenThe FrailThe Stain
Big HornRag Mega
Bumbino
Chapter 2.5
Stage Mines icon.pngStage Ashpit icon.png
Reap CreepTuff TwinsHornfelGreat GideonSingeThe ShellThe Pile
Chapter 3
Stage Depths icon.pngStage Necropolis icon.pngStage Dank Depths icon.png
The AdversaryThe BloatThe CageThe GateMonstro IIGishLokiMask of InfamyWarThe FallenThe Headless HorsemanMom
Brownie
Sisters Vis
Reap CreepThe Pile
Chapter 3.5
Stage Mausoleum icon.pngStage Gehenna icon.png
The SirenThe HereticThe VisageThe Horny BoysMomMom's Heart
Chapter 4
Stage Womb icon.pngStage Utero icon.pngStage Scarred Womb icon.png
BlastocystThe BloatConquestDaddy Long LegsTriachnidDeathLokiiMama GurdyMr. FredScolexTeratomaThe FallenThe Headless HorsemanMom's HeartIt Lives
Sisters VisThe Matriarch
???
???
Hush
Corpse
Stage Corpse icon.png
ChimeraThe ScourgeRotgutMother
Chapter 5
Stage Sheol icon.pngStage Cathedral icon.png
SatanIsaac
Chapter 6
Stage Dark Room icon.pngStage Chest icon.png
???The LambMega Satan
The Void
Stage The Void icon.png
Delirium
Home
Stage Home icon.png
DogmaThe BeastUltra DeathUltra FamineUltra PestilenceUltra War
Greed Mode
Ultra Greed
Ultra Greed
Ultra Greedier
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