IsaacHDXxx form2Isaac RebirthKeeper sprite

A very thin and dark colored mushroom.


Isaac's head becomes smaller, though, like the other mushrooms, his hitbox is not affected.

Increases Speed by 0.3, increases Tears by 1.7, while multiplying Damage by 0.9, then subtracting 0.4.


  • Cancer - Breaks the default rate of fire cap, giving Isaac a very high fire rate.
  • The Muligan - And other "effects on hit" items due to the high fire rate.


In Rebirth, Odd Mushroom (Thin) can be found in the first treasure room using the following seed(s):

  • L4QE 2MJR

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