User blog comment:DragonbornMAGE/Short view on Dwemer disappearance/@comment-4975504-20130102040236/@comment-26474238-20130103050048

Lorkhan was not involved with the Numidium at all. The heart of Lorkhan was originally going to be used as the power source for the Nimidium, but was never integrated before or during the war which resulted in the banishment of the entire Dwemer race. (This isn't even taking into account the second Numidium, which Dagoth Ur was attempting to create for use with the heart of Lorkhan, but was stopped before he could succeed.) And by the time the Numidium was actually used, the heart of Lorkhan was already gone. And I really don't care if he created certain aspects of TES lore. Unless directly confirmed by the entire developer team, there's no telling what he's making up or what he's explaining in his own personal perception.