The Battle For Eternia board game was released in 1986. Unlike many Masters of the Universe board games, it was created in-house at Mattel, and appears in the 1986 Mattel dealer catalog. Mattel's design team initially worked on quite a different concept for the game, which would have involved little toy cannons and cardboard dioramas of Snake Mountain and Castle Grayskull. It looks like the point was to earn points by shooting projectiles through the holes in your opponent’s diorama. The actual game that Mattel produced really had nothing to do with that concept. Instead it was a more traditional…