Shadowfall. The Godslayer Series: Book One

Four thousand years ago, a great war took place among the gods, which shattered their heavenly realm. This Sundering created the land of Myrillia, where near-invincible gods live amongst men. Yet the weapon that fashioned the Sundering may also strike down the immortals, as failed Shadowknight Tylar discovers. He witnesses the death of a god, whose blood heals his deformities but brands him a Godslayer and a hunted criminal.
Tylar flees with now god-like powers, seeking to avenge the god's death and clear his name. He must ultimately confront the greatest god of all and face the supreme treachery ...