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Boss Fistula.png
Base HP
Large: 60
Medium: 15
Small: 8
Stage HP
Found In
Stage cellar.png Boss Challenge Room Icon.png Super Secret Room Icon.png
Stage caves.pngStage depths.png
Stage utero.pngStage chest.pngStage dark room.png
Stage womb.pngStage utero.pngStage cathedral.pngStage sheol.png
Stage chest.pngStage dark room.png
Dropped Items
Boss Boss  

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 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.

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.
  • Unlike the original "Binding Of Isaac", Fistula doesn't bounce off of Rocks.
Bosses Boss Monstro.png
Chapter 1 Blighted OvumDingleThe Duke of FliesFamineFistulaGeminiGurdy Jr.GurglingsThe HauntLarry Jr.MonstroPinStevenWidow
Added in Afterbirth DangleLittle HornRag ManTurdlings
Chapter 2 C.H.A.D.ChubDark OneGurdyGurdy Jr.The HollowThe HuskMega FattyMega MawPeepPestilencePolycephalusCarrion QueenThe Wretched
Added in Afterbirth The ForsakenThe FrailThe Stain
Added in Afterbirth † Big HornRag Mega
Chapter 3 The AdversaryThe BloatThe CageCarrion QueenThe GateGishLokiMask of InfamyMonstro IIWarThe WretchedMom
Added in Afterbirth Brownie
Added in Afterbirth † Sisters Vis
Chapter 4 BlastocystThe BloatConquestDaddy Long LegsDeathIt LivesLokiiMama GurdyMom's HeartMr. FredScolexTeratomaTriachnid
Added in Afterbirth Blue Womb Added in Afterbirth Hush
Chapter 5 The FallenIsaacSatan
Chapter 6 ???The LambMega Satan
Added in Afterbirth Greed Mode Added in Afterbirth Ultra Greed
Added in Afterbirth † Ultra Greedier
Added in Afterbirth † The Void Added in Afterbirth † Delirium
Chapters 1-4 The FallenThe Headless Horseman

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