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Jr. Fetus Boss

A new boss mod for The Binding of Isaac Afterbirth+, adding Jr. Fetus, a new Caves boss.

He has a 15% chance to replace the normal Caves boss, and uses missiles as his primary means of destroying Isaac!

This mod was developed by
OrigamiDragon (art + animation)
Krowski_nall (art)
and Meowlala / DeadInfinity (code)

We hope you have fun playing our mod, and that you look forward to more neat bosses to come!

Note: Required to play is my Simple Boss API, which I've designed to hlep me make these bosses. It contains useful functions for things like boss splash screens, boss pools, and general boss ai. Feel free to use it in your own mods!