Ur-Priest

The Ur-Priest is an evil Prestige Class in Dungeons & Dragons 3rd edition, introduced in the Complete Divine and Book of Vile Darkness sourcebooks. In many ways mechanically akin to a divine-focused Spellthief, the Ur-Priest's fluff is that they are typically an evil and power-hungry soul who seeks to steal divine magic from gods so they can have that power without needing to go through the trouble of worshipping and serving them. Ironically, there are non-evil themes for them; an Athar who uses their abilities to provide healing magic to his fellows whilst emphasizing his point that the "Powers" aren't worthy of being called gods, or the last priest of a dead god who seeks to "borrow" magic from others whilst he crusades to resurrect his fallen master.