Exterminators is a mod where you can make your own army by using the organs of various mobs.

You can make an Exterminators Guide by crafting it with 1 Rotten Heart and 1 Book:

You have to craft the entities called Exterminators yourself by killing mobs and getting their organs, for example, the Rotten Heart is the core for most of the land and air-based entities so far; and is gained by killing zombies. The Sunken Heart is the core for aquatic Exterminators.

Exterminators will fight for you and act as various defenses and have different recipes for each Exterminator. For example, Slashers are basic infantry units and are crafted with 1 Rotten Heart and 2 Stone Swords, and Stingers are tanky air units that shoot projectiles at enemies and apply slowness and poison and are crafted with 1 Rotten Heart and 4 Squid Tentacles(which are gained by killing squids.)

Recommended to be played with JEI and Jade

REQUIRES GECKOLIB:https://www.curseforge.com/minecraft/mc-mods/geckolib