Board Thread:General Discussion/@comment-76.241.66.92-20130728035433/@comment-25047024-20131231124457

The Thu'um is a Mundus-thing. Shor and Kyne can speak it, a Dragonborn can speak it too, but the problem is that it's basicly Nirn-only.

I mean with this, that something which works on Nirn doesn't have to work in Oblivion or Aetherius. The Daedric Princes are, theoreticly, the most powerful entitys in their own realms. They make the 'rules', like Sheogorath said many times. The Thu'um works in Apocrypha and the Soul Cairn. But it doesn't work on Hermaeus Mora or the Ideal Masters, because they don't make it work on them.