Fuath Druids - murderous cultists
The Fuath Druids were villains that appeared in the cartoon series Mighty Max.
Followers of Fuath and descendents of the ancient druids of Ireland, these misguided humans worshiped Fuath as a god and offered him regular human sacrifices until the day he could be freed from his prison.
However the cultists were being played for fools by Fuath and upon finally being set free the mechanical monster began to destroy them, becoming their destroyer rather than their prophesied protector.
Following Fuath's defeat the Fuath Druids presumably gave up their worship of the false-deity and went back to their lives.