Emperor Awakened - K D Robertson - Bog

His empire stands ready, even as old friends march against him.
Mykah is ready to march on the capital and slay the emperor's killers but his enemies have other plans. The corrupted Empire has pincered him. Armies approach from all directions.
Worse, those armies are led by some of his oldest friends.
To win this multifront war, Mykah must adapt. He must continue to train and cultivate his allies. By investing in those around him, such as the berserker demi-oni Hish and the sorceress Ilsa, he can train new heroes to lead his armies.
All is not well within his territory, however. The demi-oni have tasted the freedom denied by their full-blooded cousins and Mykah finds himself caught in a centuries-old conflict.
With an ever-growing list of objectives and no time to waste, Mykah will need to prove that he is fit to be emperor.
Or he'll fail, and an old friend will ensure that death is the least of his worries.