Gravemonger (Patreon)

 A single zombie is of little concern, but there's no such thing as "a single zombie". Zombies are always found in hordes, and no matter how low their numbers are brought down, the return of the undead is as inevitable as death itself. Having no individual thoughts besides an endless hunger, zombies move and act as one to destroy any obstacles between them and their next victims. This gestalt behavior of theirs has led to some hypothesizing that zombies possess a sort of "hive mind", although no proof has ever surfaced.

Until one day, a combination of illegal chemical dumping and a long-forgotten mass grave beneath the local cemetery allowed something else to surface...