What if Equestria was on Nirn? The planet that The Elder Scrolls is set. The Mane 6 get lost after a friendship problem and end up in the continent named "The Arena" AKA Tamriel.
This takes lore from all of them, except the travels games "Stormhold and Dawnstar" Although I'm debating Shadowkey and it also takes all the lore from MLP, obviously.
It is set during late Season 8 on the MLP side, and set during the events of Skyrim on The Elder Scrolls side.