The hanged god trilogy

Norse chiefs meet Christian kings on Midgard's battlefields, as Loki's army of the dead clashes with Odin's golden shields on Asgard. An ancient premonition of death hangs over all. Only two are free to choose their paths, to prevent the annihilation of the Nine Worlds: Ragnar, a storyteller who holds all fates in his hands, and Hilda, a warrior with no fate at all. Death, pain, and fear.