The Adventures of Mr. Willickers the Rotting Mule

Along came a mule… You'd better run, because Mr. Willickers is close behind. The last of his decaying taste-buds seek the flesh and bone of your first born son. A paramilitary band of fighters is on your side, but even their selfless sacrifice will only serve to deter the creature. Your car is dead. Your body is waning. Your son’s fever is growing worse. Can you hold out until rescue comes?