Board Thread:Lore Discussion/@comment-204.169.134.11-20130910155846/@comment-77.53.70.152-20140226175455

First of all, as already stated, Kagrenac used three tools named Sunder, Keening and Wraithguard. A hammer, a knife and a gauntlet respectively. In one way you're correct since only Sunder and Keening was used on the Heart, but that would be lethal without Wraithguard.

Second: No one can be 100% sure what actually happened to the Dwemer. Not even Yagrum Bagarn (a dwemer who survived due to him technically not being in Mundus at the time) knows what happened even though it's implied in the game Morrowind he knows more about the situation than the player. What I mean is: They could've died but they could've also been transported somewhere else or even have been transformed into something that wasn't visible to the Dunmer (then Chimer) who fought them at the time. The only thing known as a certain fact is that Kagrenac used his tools on the Heart of Lorkhan at the same time the Dwemer seemingly disappeard without a trace.