The Majigen (魔次元), also known as the Demon Dimension or Damned Dimension in some western localized versions, is a realm that is owned by Jedah, as well as a device to recreate Makai under his control, including both the supernatural and humanity.
It was created primarily with Ozom's soul and countless others, and the Dohma Castle. It also contains the Fetus of God, a supernatural being that would descend from it.
Defeating Jedah will cause the Majigen to return back to Makai.
The Majigen appears to have a vast area of bodies of water, jungles, and even its own flora. The wild life in this realm also contains large bugs that are smart enough to talk to others who are equal in terms of intelligence. This realm also contains two moons.