User blog comment:DragonbornMAGE/Short view on Dwemer disappearance/@comment-26474238-20121230093048/@comment-184.35.92.229-20130104232553

To

Claymore, first, Lorkhan was "rogue" in the sense that he betrayed the other Gods, tricking them into creating Mundus, which is why they sentenced him to "death" and removed his heart, throwing it out into the world, where it formed the Red Mountain of Morrowind. Secondly, Mundus is the Mortal Plane that Nirn (the planet the games take place on) resides in, so they are not separate planes. You are right, however, that we can't assume the Aedra willed the Dwemer out of existence. There is enough evidence to support more than a few theories about what actually happened, but in reality we can't know for sure unless more information is released, possibly in a DLC (what better place to have a Dwemeri DLC than Skyrim, their home province?).