Infernal by Mark de Jager
PART MAN. PART MONSTER. ALL VENGEANCE...
In the war-torn lands of Krandin, a kingdom fighting against the Worm King of the Penullin Empire and his dark magic, a stranger wakes, knowing only that his name is Stratus.
He possesses great strength and magic, but only fractured memories of his past, and a growing certainty that he is not, in fact, human.
As he explores this new world, disoriented, making few friends and many enemies, the battle for his mind will determine the fate of the world.