Tomb of Zhang the Horrific

From publisher blurb:

Zhang the Horrific was a ruthless mercenary that worked for anyone that could afford his fee. This most unlikely person became a hero to a nation and led them back from the brink of extinction. Betraying the evil Great Old One, he led the Rover peoples in many victories over that evil demigod. Unfortunately, in this war of survival, Zhang died, and his body upon a funeral pyre to releasing his soul from the mortal world. Years later, the Rovers learn that it was not his body they burned, but an imposters, and the actual remains lay rotting in some unholy crypt constructed by none other than the Great Old One. Now Zhang's body must be reclaimed and his honor restored.