The Ragnarok Era2 books in series
The Apples of Idunn Publisher's Summary
Odin, jarl of an Aesir tribe, earns the attention of a goddess by slaying a giant. His valor prompts her to give him the apples of immortality - in return for marching against the gods of Vanaheim. He must risk everything to overthrow those he once worshipped, but doing so offers him the only chance to free the world from the mists of Niflheim. And before he can march on gods, he must make his own people see him as one.