Lost Tales from the Borun-Ma: Frost Sky, Pale Moon, Bright Stars. The Borun-Ma Series, #3

When two men on opposite sides of a war join forces for a common causeWORLDS WILL FALL. After the loss of his wife, the Demon Lord Shai Tan wages a war that will only end when he rules the Borun-Ma. What moves him, though, is more than anger or the desire to make this world safe for people with magic - it's the belief his wife has reincarnated in someone else's body. That someone happens to be Nan Jun, one of the members of the rebel force that opposes and thwarts Shai Tan's tyranny, and who has every reason to hate and want the Demon Lord dead.
Intent on waking his wife's soul, Shai Tan launches a campaign of deceit against Nan Jun, forcing the two men into a deadly game that threatens not only their lives, but of those they hold dear. Soon, what ties them together surpasses mutual hatred, and while Shai Tan no longer knows if what lures him to Nan Jun is the soul of his dead wife or the rebel himself, Nan Jun is bound to face emotions he's long fought against and refused to accept.
But events that were set into motion long before they met are about to unravel, as they realise Nan Jun can either be the bane of Shai Tan's existence or the man who saves his life. The contents of this book may not be adequate for every reader, as it addresses themes that may be triggering and harmful to certain individuals.