Deathgods

Save the living or honor the dead? Hard choice when you already have both feet in the grave. Ronan the Soulless has waited two thousand years for revenge against the man who murdered him and burned his family alive on the shores of the Irish Sea. Vengeance drove him to sell his soul to his supernatural masters. Now he lives on as a Deathgod -- human warriors brought back from the dead and charged by their masters with maintaining order in the multiverse.
Ronan and his beautiful Japanese demon companion are ordered to protect two mortals who hold the power to prevent a plot to usher in a new age of chaos. An army of evil spirits, demons, and dirty supernatural politics pale against the real enemy he must face in the coming storm: Himself.
One of the humans holds the soul he has spent his afterlife secretly hunting in order to send it screaming into hell. Now, finally, the murderer is within his reach. Justice for the ghosts who haunt him still. Too bad our world must burn for him to get it.
The universe loves irony.