God of War: Ashes of the Aesir

After the fall of Asgard, Tryg wakes in a realm of ice, grief, and ancient things best left buried. The son of a dead Aesir god and a mortal woman who taught him kindness, he wants only to return to his mother and learn what became of the people Asgard abandoned. But the Nine Realms have changed after Ragnarök, and blood is not an easy thing to outrun. — Description from novelcodex.org