Existence is not supposed to be optional in this flat, polytheistic world - it is the dictate of Etre, one of the world's three founding gods. But Sanct, a man lacking memories, skills, and purpose, possesses, (or is possessed by), an object that seemingly ignores the gods' rules with impunity and to make matters even more confusing, Sanct is purportedly one of the gods' servants.
As the world is soon to discover, when the deities are forced to play by their own convoluted rules, even they can make mistakes.
Ending an Ending is a must-read for any lover of fantasy.