Board Thread:Skyrim/@comment-1157147-20130322022136/@comment-93.184.195.190-20150615133150

Personally, I don't think that Vulthuryol got there by accident. In my mind, it doesn't make sense that a Dwemer made orb that reacts when you shout at it, would randomly summon a dragon.

My theory is that the Dwemer captured and subdued Vulthuryol. Blackreach is a gigantic Aetherium mine, from which some of the most powerful artifacts were created. Most likely, they went to EXTREME measures to assure the mine's safety. Thus, they caught a dragon from the surface, placed him in some kind of slumber, for him to be awakened if he was needed to kill invaders in the mines. Or the dragonborn accidentally fires a shout at the orb.

That, at least, is my theory.