An early sketch of the map of the Upside Down and the Abyss had Vecna’s realm called the Shadowfell. That’s the name of the Plane of Shadows first used in Dungeons & Dragons 4th Edition in 2008. It’s also home of the dread vampire Strahd Von Zarovich, who the party fights in Mike’s final D&D game.

A new documentary has revealed a surprising detail about the Stranger Things series finale following its release.