The Blight no longer waits at Red Mountain in The Elder Scrolls III: Morrowind

Image credit: Expanding Blight by Cybvep via Nexus Mods.

Red Mountain is supposed to be a threat to all of Vvardenfell, yet a wandering adventurer can spend an awfully long time ignoring it. Expanding Blight makes that neglect visible. Over in-game months, storms can spread beyond their usual territory, and people in affected settlements begin talking about what they're seeing.

Your actions still matter. Killing ash vampires slows the advance, while completing the main quest stops it altogether. There is no hidden game-over countdown, and the mod changes weather and dialogue rather than forcing an apocalypse. For OpenMW players, it gives Morrowind's central danger a way to follow you even when you're busy with everything except saving the island.