C.J. Pyrah 
Heresy [EPUB ebook] 

Betrayed and left to die in the bowels of Karpella Castle, Torben’s plan lies in tatters. He’s lost his fortune and an ancient threat has been unleashed on the world of Ulskandar, leaving him to fight for his life.
A resurgent evil once again threatens the Kingdom of Dazscor & Aramore. Torben must join friends old and new to thwart the mage Aristotles, or risk the land falling under the shadow of a malign deity that wishes to enslave all to its will.
Will Torben have the strength to join a fight hundreds of years in the making — or will he fall prey to the Dead God?