you should play the enderal saga , it’s the closest to what you are looking for. It’s a collection of total conversion mods for the tes games. Enderal is widely known since it relseaded for Skyrim but there’s also Nehrim for oblivokn and arkwend and myar aranath for Morrowind.

8 personally love Nehrim so much I have over 300 hours played on gog and haven’t even finished the main story yet