What is the magicka-draining voice in Labyrinthian?
I was doing the quest "Staff of Magnus" in Labyrinthian, and I wonder whose is the ethereal, magicka-draining scary voice in that place? Is that the voice of Morokei, a Dragon Priest in the end? Or something else? I'm just interested in how the story of Skyrim explains that. Thanks.
Yes, the voice is that of Morokei.
The conversation gives you a bit of a background to the story with regards to Morokei and the person he fought with.
The mana draining is also from Morokei, but is a one time scripted event so it does not reoccur even if Morokei is still alive.