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Problem 1: We have this King Grayskull character who was Boring He-Man in a 2003 cartoon episode, then He-Man's boring black ancestor in Valhalla in Revelation.
Problem 2: Mattel/Axel are trying to add a Skeletor lookalike to Preternia.
I propose a solution: King Grayskull was a black-skinned heroic enemy of the Snake Men who resorted to taking the power of evil as well as good to fight the Snake Men. A good magic-user killed him, but he continued to exist as a lich who goes by "the Great Black Wizard".