Eternian refers to the inhabitants of the fictional planet Eternia, which is the primary setting for the He-Man franchise. This universe features a variety of characters, including heroes, villains, and mystical creatures, all of whom play a role in the ongoing battle between good and evil. The most notable character from Eternia is He-Man, the alter ego of Prince Adam, who transforms into a powerful warrior to protect the realm. Eternia is characterized by its magical landscapes, ancient technology, and a rich history that includes the conflict between Skeletor and the forces of good.