MOD NEED'S GECOLIB!!!! (<--- link)
Welcome to Withering Away!
it's a infection mod, based on the wither
and the concept of "withering".
It's also a re-creation of my first ever mod!
(that's why there is "Reborn" there)
The infection will start after you kill the wither (boss),
or you can use a commend to start it imidietly
(/begin_wither_infection)
the infection will come trow a "dimantional rift",
that will mess with mob spawning in the dimantion it is in
(thats how wither got in in the first place)
the infection will become stronger overtime, but don't warry!
there are in-game items that will help you battle the infection
(i recomend JEI for crafting recepis)