Oblivion Portals are portals to the Atoll of Immolation public dungeon which appear at random around Blackwood and the Deadlands. Upon entering a portal, you must fight your way between islands to reach the Havocrel's Tower in the centre of the map. There you must defeat the Havocrel Duke of Storms to be able to shut down the machinery and return to Tamriel.
Unlike other World Events, there is nothing on the map to indicate where or when an Oblivion Portal has opened; you must come across an open portal in the wilderness of Blackwood in order to take part. However, their vertical pillar of orange light can help identify them from a distance. When a portal spawns, Dremora will emerge but they do not need to be fought to enter the portal.
For more information on what you might encounter within the portal, please see the main article.
The final loot chest has a chance to contain the following items:
- Daedric Enchanting Apparatus antiquity lead for the Daedric Enchanting Station
- Warm Asymmetrical Ruby antiquity lead for the Death Dealer's Fete
Note that the lead for the Daedric Enchanting Station can only be obtained if the area is entered through a portal in The Deadlands. And the lead for the Death Dealer's Fete can only be obtained through a portal in the Blackwood. There are 2 different Atolls of Immolation.
- Unlike other World Events, the final boss will eventually respawn in the main room.