The Elder Scrolls 4 : Oblivion - Oblivion Crisis Mod

                    
In this mod, respawning daedra from the Oblivion gates attack the nearest town. This gives you a strong incentive to close the Oblivion gates or complete the main quest. Have you ever thought, "Oblivion Crisis? What is the big deal? The gates don't even open if I don't play the main quest. If I do play the main quest, then the Oblivion gates are just mainly there as scenery. The daedra mostly don't invade Tamriel. They just hang around by their gates. If I leave them alone, they will leave me alone, and everyone else too. Sure, they really did a number on Kvatch, but then is it like they ran out of steam and don't have the strength or will to attack any more cities. (Unless you play through the main quest to get to the points where they attack Bruma and then the Imperial City.)" So the Oblivion Crisis can come across as seeming rather lame or weak.