Sanguine Soul

Malieun is a powerful warlock-king who has ruled his domain for many years. Betrayed by his own people, he is struck down by a wandering wizard named Noor — a blow that should have been fatal. At the edge of death, he discovers a new power: the ability to convert magic into life force and life force back into magic. Using the last of his strength to survive, Malieun begins a campaign of revenge against Noor, turning his unique ability into both weapon and lifeline as he tears through everything standing between him and the man who cursed him.