Warlock With a Shotgun

Betrayed by a warlord, his own brother, Agoir summons a deity to gain the strength he needs for revenge. The deity, though angered at first, is amused by the idea and accepts Agoir's request, turning him into a warlock, and itself into his patron. It shifts its form to become the strongest weapon of all, for Agoir to use in his righteous vengeance.

A weapon known as the lever-action shotgun.