what is anti-birth

[Inaudibleloki]

im 99% sure im just stupid but idk what it is someone tell me

[Nazemec]

Antibirth is an expansion-size mod that only works on pure-Rebirth (no expansion).
That's the most concise way to put it I can think of.

[JellyPuff]

Antibirth[antibirth.com] is a large fan-made expansion for the base game only (Rebirth without any DLC) and probably the most influential mod for this game. It's most notable for not only the amount of content it adds, but how cohesive it is with the regular game both in terms of mechanics and visual style. It fitted in so well, in fact, that the mod's creator got hired and Antibirth spun off as an official DLC in the form of Repentance, streamlining some things and adding tons more stuff.