Bloodstone - David Gemmell

The tyrannical rule of the Deacon and his Jerusalem Riders has unleashed upon the world a sea of bigotry and hatred, where Unbelievers and Mutants are massacred in the name of God and Peace. And the long-vanished Jerusalem Man is now considered a saint of the new order. To speak ill of his memory is heresy.

But when the church in Pilgrim's Valley is burnt to the ground, its congregation slaughtered, a rider appears and hunts down the killers. And word spreads - The Jerusalem Man is back!

Hunted and alone, Jon Shannow must battle the forces of the Deacon - and face a terrible enemy from another universe; a dark god who feeds on the souls of worlds.