The Divine Ascendant

After the Triwizard Tournament, a forsaken Harry Potter slays the divine wolf Fenrir in Iceland, becoming a Campione—a mortal who kills gods and steals their power. Thrust into a hidden world of warring deities and mage politics, he battles divine foes. Complicating matters are thememories of his past life as anime fan Jacob. Now, as both hunter and hunted. — Description from novelcodex.org