Everyone dies. Not everyone gets back up again afterward.
The Deep Paths are a cursed place, meant for those similarly cursed souls whom the gods themselves denied the sweet release of death. Revenants haunt the underworld, wielding forbidden powers and often consuming those who lack the strength to join them.
Reshid can't remember what he might have done to deserve such a fate, but he learns quickly that there is more to undeath than the gods and their faithful preach to the living. Revenants have a unique connection to essential magics that allows them to develop their powers in extremely diverse ways. Wherever there is power, though, one can always find those seeking to wield it, whether they be governments and gods from above, or mythical elder races from below.