Vsions:

THe hell would he want, then?
Hugh? Vampires have "eternal" nightmares. Oh don't tell me, molag bal had a threesome with vaermia, with the first vampire ?
Don't know. All I know is that vampires always had nightmares. One vampire from Illiac Bay had nightmares during his days as a vampire, same for Morrowind and Oblivion. Molag Bal mentioned something about prying a cure from Vaermina to cure vampirism, so they are somehow tied. Who knows what really happens.
Molag Bal: Vaermina, I think Arkay is too prideful. I hate that arrogant jerk.
Vaermina: What in Oblivion do you want me to do about it?
Molag Bal: Give me one of the creatures from your nightmares and dark dreams. One that is neither dead nor alive that loves to feast on the flesh and blood of mortals! The scariest beings!
Vaermina: You want to make them manifest into Tamriel and be a patron?
Molag Bal: Yes.
Vermina: Fine, let us negotiate something.