Mutant (boss) Mutant is a humanoid, made up of vanilla bosses, and the final boss of Fargo's Mod, with 3,850,000 health ( 7,700,000 health in Expert Mode ). It is summoned by throwing Abominationn Voodoo Doll into lava or using the Mutant's Curse. It is the strongest of the 3 siblings, most of its attacks being either based on vanilla bosses or.