The Elder Scrolls

There's so much lore that has never been in any of the games except for books you find lying around. it'd be easy to make a new(ish) story without even needing much ground work. The games only focus on the 3rd and 4th era while the other like, 5 eras never get told. Like, what happened to the dwemer? How was the empire formed and what was the conflict like with the other provinces before they joined? What was the empire like under the Pelagius the mad? What was it like during the Mythic Era? What was it like for Talos to ascend to Godhood? What are some of the other planes of Oblivion like? There are so many stories that could be told in depth that just get glossed over in the games through books and dialog.