The Sorcerer's Return (The Sorcerer's Path) by Brock Deskins

Azerick has come back from the abyss in order to try and unite all the races against the return of the old gods who seek to destroy them and subjugate the few they allow to survive a brutal purging. However, fighting ancient gods may be the least of his troubles as he battles to save a fractured kingdom, a brilliant son traveling a dark path, and the splintered soul of his own humanity.