Board Thread:General Discussion/@comment-79.77.208.17-20140724190335/@comment-31674338-20170802123208

Guys do you remember the quest about Azura's Star ? Or Arniel's Endeavor? Malyn Varen tried to make his own realm inside Azura's Star and was cursed by the daedra and needed souls to maintain its immortality inside the star, Arniel was more or less successful than Malyn because his soul was absorved by the Dragonborn and not by the soul gem as he thought it should happen and he used methods similar to what the Dwemer used in the Heart of Lorkhan, but he only had Keening and used a Soul Gem instead.

Conclusion? I think the Dwemer created their own (divine) realm inside the heart and reached some sort of Apotheosis to make the entire race immortal in another plane beyond Mundus I don'k know. But I think it makes sense.

This theory is from a video I saw in ESO channel at YouTube.