d20 Apocalypse - Exit Mundi
Ghouls are horrific monsters, once human but now twisted by some terrible effect into ravening, emaciated creatures, lashing out at the world around them in madness and terror. They attack any living thing they see, and most attempt to then eat anything they kill. It’s not known if they draw any sustenance from the things they eat, or if they just re-enacting their previous lives.
Most horribly of all, mere bodily damage does not stop a ghoul. Only the complete destruction of the brain controlling the body will stop these mad berserkers when they go on a rampage. Ghouls have been known to carry on attempting to attack and eat a target after losing entire limbs, or even being blown in half. What drives them or even keeps them animate is a mystery.