Davek,
Well I have the idea down now:
A cleric of Orcus, formerly just a low level semi-nobody that was apprenticed to a much more powerful cultist, comes back to his home town to wreak vengeance on his former home. In the process of doing so, he uses a couple powerful artifacts that he stole from the corpse of his mentor who died in the Abyss. One of them is a Talisman of the Beast, a powerful totem of Baphomet, which can turn any animal (with the right amount of sacrifice), into a humaniod. He then uses the Talisman to turn two herds of sheep into his willing servants and send them out to attack the village (which has been already decimated by plague zombies, unruly swarms, and even a couple near vampire spawn.) The PCs then defeat the mob of humaniod sheep, find the cleric, only to see him near death after his master's former compartriot, a powerful demon, steals back the artifacts to help in an ascension ritual key for Orcus to become not only the new Prince of Demons, but a powerful god in his own right.
Whadda think so far?