D. E. Herweyer 
Guardian of Valia — Treachery [EPUB ebook] 

The world of Astrilla is on the brink of total annihilation, while the nation of Valia blindly wars with itself and others in its thirst for power. All they know, all they are fighting to hold on to, is nearing destruction at the hand of a sorceress, while a malevolent force waits in the dark to destroy not just their nation, but their entire world. Three brothers must find a way to save their nation from itself and the chaos it is heading towards, while they try to uncover this darkness that is changing their world, destroying it, piece by piece.