Original Demon King. He was sealed in the Dimensional Rift.
In the original timeline, he was an avid researcher and proud father of two kids, Lake and Shion. He would research about magic to no ends, but would still care for his family. When Lake was 3 or 4 years old, he and his mother were caught in a landslide and died. He was devastated by their deaths, and became more obsessed with his research. Sometime later, it is hinted he created magic, and went on a rampage with it. After Ross and Crea defeated him, magic was lost in the world, until Alba recreated Mana.
After Elf's interference, he discovered Mana early on, and repeatedly tried to create it. He had Elf's book with him, and therefore had more information to go to, although it wasn't much. However, Elf later left him a time travel machine, which he unknowingly brought home. Lake, who was only 3 or 4 years old at the time, played with the machine and sent himself and his mother to the future. Devastated by their disappearances by the machine, which he mistook as them being killed by it, lost his sanity and became more obsessed with his research.