Just to mention for CarnivalGoat's comment; I am running a zombie apocalypse campaign in live. I applied a scenario where Cyric wiped his own memory, lived as mortal and then died (by his own design no less) and as he was brought before Kelemvore to be judged, he had arranged his own life so that he would be godless human (and his deitic powers of deceptions and lies concealed his nature from Kelemvore and anyone).<br/><br/>So Kelemvore cast a god onto wall of faithless and it created paradox which resulted wall becoming shattered! Resulting all faithless souls breaking free and creating a unique breed of undead which had<em>faithless</em>template. Which in short rendered all undead spawns created with these faithless souls who broke free and re-entered Faerun (thanks Cyric who regained his memory in explosion and gated undead onto Faerun) immune to all divine magic and divine powers (including rebuking/turning). Arcane magic works just fine against the undead. But anything from divine source was powerless.<br/><br/>Plaque itself manifests as a curse than disease (so very first victims were paladins who thought the undead 'plaque' was a disease).<br/><br/>Now why Cyric did this? So that he can create alter ego who acts like a good deity and thanks his connection to faithless he can make his clerics powers work on them. Overall though apocalypse was meant as means weaken bonds to other deities and make his new alter ego 'superior' to them with flock of worshippers who sees he is more powerful deity than any other because it defeated the undead plaque (a plaque which he engineered).