Arena started it all, with the entirety of Tamriel generated for you to explore freely. Daggerfall moved that into a smaller region with political intrigue and a detailed character system. Morrowind took it to new exotic lands and introduced the series to both consoles and the world of modding and creators. Oblivion brought us to the heart of the Empire, realms beyond, and all new gameplay mechanics. Skyrim let you do battle with dragons in Tamriel’s harsh northern province.
Reading this paragraph kind of highlights when they stopped innovating