The Mists of Niflheim Eschaton Cycle

Beyond mist ... lies darkness. Idunn’s apples made Odin a god-king. Now, she calls upon him to overthrow her people—the very gods he has long worshipped. In his way stand mist-worshipping sorcerers, draugar, trolls, and all the horrors of Hel. Can Odin guide his people past such threats? And even if he can reach the gods, can he defeat them?