Ad blocker interference detected!
Wikia is a free-to-use site that makes money from advertising. We have a modified experience for viewers using ad blockers
Wikia is not accessible if you’ve made further modifications. Remove the custom ad blocker rule(s) and the page will load as expected.
A cluster of red cellular flesh.
Makes a fetus grow on the side of Isaac's head.
Increases available maximum Heart Containers by one and heals one and a half-hearts.
Increases Shot Speed by 16%
- Stem cells are an undifferentiated cell of a multicellular organism that is capable of giving rise to indefinitely more cells of the same type, thus why another human is growing out of Isaac.