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Fistula

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Boss Fistula name.png
Boss versus screen image
 
 
Table dividing line 1.png
 
In-game appearance
Table dividing line 2.png
 
Boss
Stage The Cellar icon.png
Challenge Room Icon.pngBoss Challenge Room Icon.pngSuper Secret Room Icon.png
Degraded Boss
Small
Stage The Caves icon.pngStage Flooded Caves icon.png
Stage The Depths icon.pngStage Dank Depths icon.png
Stage The Womb icon.pngStage Utero icon.pngStage Scarred Womb icon.png
Medium
Stage The Depths icon.pngStage Dank Depths icon.png
Stage The Womb icon.pngStage Utero icon.pngStage Scarred Womb icon.png
Stage The Chest icon.png
Large
Stage The Womb icon.pngStage Utero icon.pngStage Scarred Womb icon.png
Stage Cathedral icon.pngStage Sheol icon.png
Stage The Chest icon.png
Table dividing line 3.png
 
Boss Boss

Fistula is a boss that can appear in the Cellar. The large size Fistula has 60 HP, the medium forms have 15 HP, and the small forms have 8 HP.

Behavior[edit | edit source]

  • Moves around the room slowly, bouncing off the walls.
  • When enough health is depleted, the one large Fistula breaks into four medium Fistulas.
  • Each of the four medium Fistulas break into two small Fistulas.
  • After the smallest Fistulas are defeated, they spawn Chargers unless they are over a pit or other obstacle.
  • All stages of Fistula will do 1 red heart of contact damage.

Champion Versions[edit | edit source]

  • Black: Spawns Boom Flies instead of Chargers. Each piece travels much slower, and splits into three medium Fistulas as opposed to the original's four, similar to Teratoma.

Gallery[edit | edit source]

Trivia[edit | edit source]

  • Fistula appeared in the original The Binding of Isaac.
  • A fistula is an abnormal connection between organs, intestines, and other tissues.
  • Fistula’s splittings after taking enough damage is most likely a reference to the game Asteroid, where asteroids would float diagnally and split after taking enough damage. This was confirmed by Edmund McMillen.
  • Fistula used to be a Caves/Catacombs boss in the original "Binding of Isaac", but as of Rebirth, it is a Cellar boss.
  • Teratoma is the posthumous version of Fistula.
  • Unlike the original "Binding Of Isaac", Fistula doesn't bounce off of Rocks.
  • Fistula was inspired by a boss of the same name in another Edmund McMillen game, C-Word.
  • Added in Afterbirth † Fistuloid is an enemy variant of this boss combined with what looks to be a Charger or Spitty.
  • Added in Afterbirth † The Matriarch is a boss added in Booster Pack #5 that is simultaneously based of a Fistuloid, Chub, and this boss. The Matriarch will also spawn small Fistulas throughout the battle.


Bosses Boss Monstro.png
Chapter 1
Stage The Basement icon.pngStage The Cellar icon.pngStage Burning Basement icon.png
Blighted OvumDingleThe Duke of FliesFamineFistulaGeminiGurglingsThe HauntLarry Jr.MonstroPinStevenWidowThe FallenThe Headless Horseman
Added in Afterbirth DangleLittle HornRag ManTurdlings
Chapter 2
Stage The Caves icon.pngStage The Catacombs icon.pngStage Flooded Caves icon.png
Carrion QueenC.H.A.D.ChubDark OneGurdyGurdy Jr.The HollowThe HuskMega FattyMega MawPeepPestilencePolycephalusThe WretchedThe FallenThe Headless Horseman
Added in Afterbirth The ForsakenThe FrailThe Stain
Added in Afterbirth † Big HornRag Mega
Chapter 3
Stage The Depths icon.pngStage Necropolis icon.pngStage Dank Depths icon.png
The AdversaryThe BloatThe CageThe GateGishLokiMask Of InfamyMonstro IIWarThe FallenThe Headless HorsemanMom
Added in Afterbirth Brownie
Added in Afterbirth † Sisters Vis
Chapter 4
Stage The Womb icon.pngStage Utero icon.pngStage Scarred Womb icon.png
BlastocystThe BloatConquestDaddy Long LegsDeathLokiiMama GurdyMr. FredScolexTeratomaTriachnidThe FallenThe Headless HorsemanMom's HeartIt Lives
Added in Afterbirth † Sisters VisThe Matriarch
Added in Afterbirth Blue Womb
???
Added in Afterbirth Hush
Chapter 5
Stage Sheol icon.pngStage Cathedral icon.png
SatanIsaac
Chapter 6
Stage Dark Room icon.pngStage The Chest icon.png
???The LambMega Satan
Added in Afterbirth † The Void
Stage The Void icon.png
Added in Afterbirth † Delirium
Added in Afterbirth Greed Mode
Ultra Greed
Added in Afterbirth Ultra Greed
Added in Afterbirth † Ultra Greedier
The Binding of Isaac: Rebirth The Binding of Isaac: Rebirth The Binding of Isaac: Rebirth
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Characters Characters MainPageBabies.png Co-op Items Items Item Pools Item Pools Monsters Monsters Objects Objects
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