In my world the polar opposite powers of Life and Death take turns to grow or wane, like the waves push and pull.
In this particular cycle, Life is at its climax and the process of Death has started. Random humans would be infected by some death aspect powers, then they slowly transform the body into a vessel of death.
At first, the bodily functions would stop working one after another, until they stop breathing, become basically a walking zombies with their instincts turned away from directions that would breed more life to behaviors that would bring more death. Their mortal meaty parts would rot until they're all walking pristine skeletons bound together by higher power.
So they keep going with their mental faculties almost intact and society changes until all moving beings are zombies.
At that point Life started again in some random zombies.
How would life sparks again in a walking skeleton, or how would life restarted again in a world like that? I'm stumped. Obviously an immortal skeleton growing meats and then dies normally would be counter intuitive.