The Elder Scrolls IV: Oblivion
Events from The Elder Scrolls IV: Oblivion happened after the game The Elder Scrolls III: Morrowind. The Emperor Uriel Septim VII gets killed by assassins while trying to escape the Imperial City, which means that Nirn (the world) has lost its shield against the Daedra from the plane of Oblivion, which comes through the opened gates of Oblivion. The goal of the game is to find the Emperor's son, defeat the attacking Daedra, and end the invasion by shutting the gates.