this mod charge gemeni to brothers of golec, stever same but to "darkenes and demonic" version :P
charge normal boss fight to "SCIERNISKO" but ab fight to "BRACIA PIERDOLEC"
Idea is by my fan "Dr.Wąsacz niesamowity_wąsolog"

download for no-steam isaac and reabirth or afterbirth
https://drive.google.com/open?id=10t7ph5TggCHnw_i4mtnS2RGJZjhjsfPy