Legacy of Blood — Richard A. Knaak

Since the beginning of time, the angelic hosts of the High Heavens and the demonic hordes of the Burning Hells have been locked in a struggle for the fate of all Creation. That struggle has now come to the mortal realm...and neither Man nor Demon nor Angel will be left unscathed....

Norrec Vizharan has become a living nightmare. While on a quest to find magiical treasure, the soldier of fortune discovers an artifact beyond his wildest dreams: the ancient armor of Bartuc, the legendary Warlord of Blood. But the mysterious armor is cursed, channeling a malevolent power into Norrec's tortured soul. Now, pursued by demons who covet the dark armor for their own devices, Norrec must overcome a bloodlust he can scarcely control and learn the truth about his terrifying curse before he is lost to darkness forever...