Merlin: the Game
Years and years ago, the legendary Merlin of King Arthur fame got pretty annoyed. He was fed up with his reverse aging and felt like no one knew how hard it was to deal with on a daily basis. He decided to teach the world a lesson by inflicting everyone alive with the same condition. These people became Merlinoid.
He eventually became young enough that he ceased to exist as Merlin, but it was only then that he realized what he had done. As soon as he took his first breath, an incredibly powerful wizard popped into existance. Merlin had discovered the secret to resurrection, of a sort, and had given it to everyone in the world. This powerful wizard was actually Merlin, living again.
Merlin II became enraged that he had inadvertently given everyone else the ability to live forever and with his new powers, created a mighty dark Fortress. The story of Merlin faded from knowledge and the being that resided inside the fortress became known as the Chronomancer.