«The Demon King» by Chris Bunch

A decade past, General Damastes swore loyalty to the wizard Tenedos when the seer sought to realize his vision of a peaceful, unified Numantia. But although Tenedos became the Seer King, peace never came. Instead, his enemies were slaughtered and now he prepares for war.

Damastes must question his long-held loyalty and the oath he swore. And he will discover the horrifying bargain Tenedos made to gain an empire and the price that must be paid.