Michael Moorcock 
Sword and the Stallion 

Enemies become allies and allies enemies as the races struggle for possession of the Earth. Yet only Prince Corum Jhaelin Irsei of the Scarlet Robe can save them from a doomed fate. With the spear of Llaw Ereint in his silver hand, Corum must face the Cold Gods in a final battle that will defeat the forces of Chaos — or deliver the world to evil unending…