Fistula

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Fistula
Boss Fistula.png
Base HP
Large: 60
Medium: 15
Small: 8
Stage HP
0
Found In
Boss
The Cellar
Boss Challenge Room
Boss Rush

Mini-Boss
Small
The Caves
The Depths
Medium
Utero
The Chest / The Dark Room
Large
The Womb / Utero
The Cathedral / Sheol
The Chest / The Dark Room

Dropped Items
Boss Pool


Fistula is a boss that can appear in the Cellar.

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 1/2 red heart 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.

Gallery[edit | edit source]

Trivia[edit | edit source]

  • Fistula appeared in the original Binding of Isaac.
  • A fistula is an abnormal connection between organs, intestines, and other tissues.
  • 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.
  • Interestingly enough, the worms you see living inside Fistula in the Vs screen do not show up when fighting Fistula.

SmallIsaac.png The Binding of Isaac: Rebirth SmallIsaac.png

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Chapter 1 Blighted OvumDingleThe Duke of FliesFamineFistulaGeminiGurdy Jr.GurglingsThe HauntLarry Jr.MonstroPinStevenWidow
DLC Indicator.png DangleLittle HornRag ManTurdlings
Chapter 2 C.H.A.D.ChubDark OneGurdyGurdy Jr.The HollowThe HuskMega FattyMega MawPeepPestilencePolycephalusThe Carrion QueenThe Wretched
DLC Indicator.png The ForsakenThe FrailThe Stain
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Chapter 3 The AdversaryThe BloatThe CageThe Carrion QueenThe GateGishLokiMask of InfamyMonstro IIWarThe WretchedMom
DLC Indicator.png Brownie
Afterbirth† Indicator.png Sisters Vis
Chapter 4 BlastocystThe BloatConquestDaddy Long LegsDeathIt LivesLokiiMama GurdyMom's HeartMr. FredScolexTeratomaTriachnid
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Chapter 5 The FallenIsaacSatan
Chapter 6 ???The LambMega Satan
DLC Indicator.png Greed Mode DLC Indicator.png Ultra Greed
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Afterbirth† Indicator.png The Void Afterbirth† Indicator.png Delirium
Chapters 1-4 The FallenThe Headless Horseman