Oblivion Gate (Oblivion)

Oblivion Gates are portals which are used as a transport by the Daedra to reach Tamriel. At the beginning the Daedra could use these gates because the Battlespire was between Oblivion and Nirn. However after he destroyed the Battlespire with the help of an corrupt Battlemage named Jagar Tharn, he managed to gain access in Tamriel with a master plan by the Mythic Dawn. Using these gates the managed to reach even outside the Imperial Palace but his actions were prevented by Bendu Olo and Martin Septim that activated the barriers that protect Nirn and called the Avatar of Akatosh. After an impressive duel Mehrunes Dagon lost and the Gates were made completely useless. Still if the player runs out in the wild he may see the ruins that were left behind.