Max Eisenhardt (aka, Magneto) is a character in the fictional Marvel universe, who was created in 1963. At times he has been a supervillain and at other times an anti-hero. Magneto is one of Marvel's A-list characters, and one of its most popular characters.
In Marvel's Cthulhu Mythos
Magneto has held various asteroid strongholds and space stations, owned various subterranean and volcanic bases, and ruled over the Savage Land and later the island of Genosha. In the Bermuda Triangle, he raised the eldritch Island M to the surface, not knowing of the imprisoned Quoggoth, rebellious creation of Shuma-Gorath. Later when he and the X-Men returned to the island and established themselves, they were forced to battle its eldritch defenses which had been activated by an alien.