User blog comment:Bethesda Softworks/The History of The Elder Scrolls/@comment-114.76.51.83-20120903105657/@comment-5514570-20130106115109

Actually, there is one theory of how the Dwemer disappeared. It actually goes long before their actual disappearance and is hard to explain so I'll simplify. The Chimer were led by a prophet named Veloth who led them to the Dwemer Kingdom of Resdayn, modern day Morrowind. The Chimer worshipped Azura, Boethiah, and Mepahala, while the Dwemer were secular. At first, the Chimer were a bit, I guess, wary, if you will, of the Dwemer because their secular ways were viewed as kinda blasphemous. Well, then, the Dwemer found the Heart of Lorkhan in Red Mountain. (Lorkhan basically gave the gods the idea of creating Mundus, eventually they found out that he actually just wanted to drain their divine power by making them create Mundus. What can I say, he was the trickster god. Well, Trinimac (now Malacath after Boethiah ate him) killed him, and Auri'el (Akatosh by some accounts) shot Lorkhan's heart into Mundus for his treachery. Well, the Dwemer found it, and Dwemer King Dumac made his scientist Kagrenac make Keening, Sunder, and Wraithguard to experiment with the Heart to turn the Dwemer into gods. The Chimer viewed this as a complete affront to their gods, and five Chimer generals led a war against the Dwemer. You might've heard of them. They were: Indoril Nerevar, Vivec, Sotha Sil, Indoril Almalexia, and Voryn Dagoth (who later became Dagoth Ur.) Well, at an assault on Red Mountain, the Chimer were kinda beating the crap outta the Dwemer, and Dumac panicked. He ordered Kagrenac to use the tools on the heart in a desperate attempt to turn the battle. Instead, it made the entire Dwemer race vanish. Now, that is just a theory, and there are probably more. Also, forgive me of I got some of the theory wrong or if you already knew it.