D.M. Cain 
A Chronicle Of Chaos [EPUB ebook] 

In a realm ravaged by war, The Brotherhood of Shadow and The Children of Light will stop at nothing to destroy each other.
Chaos is a warrior who fights for the Children Of The Light, in the name of honor and glory. The demon Anathema has pledged his loyalty to the Brotherhood of Shadows.
Arrogant and headstrong, they both believe they’re the strongest in the land. The two strike up an intense rivalry, but their obsession to defeat one another only leads them closer together.
When the forces of Light and Darkness collide, where will their loyalties lie?