Many of these mods have become an essential element in improving Skyrim for PC gamers. For example, there’s a mod for Skyrim which makes Thomas the Tank Engine a hostile NPC. Mods alter the basic code or structure of a game to make substantial changes, and these can be adding better textures, changes to how the game actually plays, or even completely wacky changes.

The Skyrim Anniversary Edition, when it launches next month, could cause problems for mod creators and render your existing Skyrim mods useless.