Fall of the Space Core, Vol. 1 on the Steam Workshop is a Portal 2-themed mod created by Valve and Bethesda for The Elder Scrolls V: Skyrim using the new Skyrim Creation Kit (thanks GameInformer). Word is: "To celebrate the opening of the Steam Workshop for Skyrim, Valve and Bethesda have teamed up to bring you the Portal 2 Space Core mod, which will let the aggressively space-centric little robot tag along on your adventures in Tamriel." VG247 makes the case for suspicions that this might hold one of Valve's Easter Eggs.