Board Thread:Lore Discussion/@comment-3348732-20130929164300

In Skyrim, you can enter Hermaeus Mora's and Sanguine's realms of Oblivion despite the walls were supposed to have sealed off. And Sheogorath had a follower leave the Shivering Isles to Solitude to bring him back, as well as Sanguine entering Nirn in disguise.

After what Martin did, how is this possible? Were the walls between worlds weakening? If so... Nirn is screwed because Mehrunes Dagon can just launch another attempt to invade, this time no way to stop him. Or did Martin only close off Dagon's realm? 