Modifications A wide variety of modifications are available for Skyrim, using the packaged "Creation Kit". These mods are aggregated on the Steam Workshop and Skyrim Nexus, among other sites. The mods include features such as more vibrant night sky, new lighting systems, new characters and locations, user interface updates, and more. The first Skyrim modification was The Fall of the Space Core, Vol. 1, created by Bethesda in collaboration with Valve Corporation. It causes the Space Core â a fictional device from Valve's video game Portal 2 â to fall from the sky and land in a burnt-out house near Whiterun. The Space Core (voiced by Nolan North) acts as a non-player character, following the player around the world of Skyrim and dispensing space-related comments. Has anyone used these Mod packs and does it make that much difference?