Doom

Doom was once a mortal man with mortal ambitions until one day he stumbled into an ancient demon that offered him almost unlimited power… for a price. He didn’t know it at the time, but that price was not only his soul, but the countless souls of any living soul he encountered. He left his home of Mausuldoom because there were simply no living creatures left to convert into his undead army.

Books 4, 5

Alive