Merlin

Merlin Ambrosius is a powerful wizard and the last of the Druids. Using magic, guile, and intrigue, he engineered the birth of Arthur Pendragon and served as his advisor, until Nimue, the Lady of the Lake, imprisoned him in a rock in the remotest depths of Brocéliande forest.

Early Life
Merlin is the child of a mortal woman and an incubus, the non-human wellspring from whom he inherits his supernatural powers and abilities.