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The Binding of Isaac Wiki

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Teratoma (テラトーマ Teratōma) is a boss added to the Wrath of the Lamb DLC. It resembles a posthumous version of Fistula.

Behavior

It acts like Fistula, but spawns 3 medium sections instead of 4. Teratoma also spawns small Spiders when the smallest part of it is destroyed. It is a boss in The Womb I and Utero I.

Total HP: 60 (large) + 3x15 (medium) + 6x8 (small) = 153

In The Binding of Isaac: Rebirth, any room layout in the Catacombs and Necropolis that should contain Fistulas in WotL now contain Teratomas.

  • Be careful to not split off too many parts at once. This could impair your ability to dodge.
  • Anything that damages multiple enemies will help you speed up the battle (especially when a larger amount of sections are present on the screen)

Champion Variant

Eternal

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Eternal Teratoma is identical to normal Teratoma, but spawns 2 extra Spiders every time it splits.

When the final small Teratoma is destroyed, it spawns a Big Spider.

Trivia

  • In biology, a teratoma is a tumor-like growth that contains normal tissue from each of three germ layers (like hair, teeth, or even bones). Like Fistula, these medical facts reference to their appearance (note the bones around Teratoma).

Gallery

Videos

Bosses
Chapter 1
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The Duke of Flies
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Gemini
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Monstro
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Larry Jr.
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Steven
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Famine
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WidowDLC.png
Pin clean.png
PinDLC.png
Chapter 2
Fistula.png
Fistula
Gurdy full.png
Gurdy
Peep Full.png
Peep
Chub.png
Chub
Chad full.png
C.H.A.D.
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Pestilence
The Husk.png
The HuskDLC.png
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The HollowDLC.png
Chapter 3
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Monstro II
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Loki
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Mom
Gish full.png
Gish
BC War.png
War
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Mask of InfamyDLC.png
Chapter 4
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Scolex
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Blastocyst
Moms Heart Full.png
Mom's Heart
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It Lives
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Death
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TeratomaDLC.png
Lokii cutout.png
LokiiDLC.png
BC Conquest.png
ConquestDLC.png
Chapter 5
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Satan


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IsaacDLC.png
Chapter 6
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Any Chapters
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The Fallen*
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Headless Horseman*
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Gurdy Jr.*DLC.png
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Blighted Ovum*DLC.png
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The Carrion Queen*DLC.png
The Wretched.png
The Wretched*DLC.png
VS DaddyLonglegs.png
Daddy Long Legs*DLC.png
Bc Bloat.png
The Bloat*DLC.png
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Triachnid*DLC.png
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