Vaernima, whose sphere is the realm of dreams and nightmares, and from whose realm issues forth evil omens.
Vaernima maintains the realm called Quagmire, a nightmarish realm. Every few minutes, there was a flash of lightning and reality shifted, always to something more horrible and horrifying.
The summoning date of Vaernima is 10th of Sun's Height. Vaernima may accept summon in her shrine, if the summoner offered a black soul gem.
Not only Daedric Prince Nocturnal that has problem with thievery, Daedric Prince of Dreams and Nightmares, Vaernima lose her orb sometime in 3E 433. Arkved, a wizard that dreamed for more Daedric power, stole the orb. He used it to explore the dream realm, when he eventually trapped inside with no chance to escape. Vaernima asked the Champion of Cyrodiil, when the champion summoned her in her shrine in Nibenay to retrieve back the orb. The orb was finally recovered and the champion was awarded with the Skull of Corruption. Detail conversation of the event can be read here. The same Skull was also given to the hero of Daggerfall some years before, after finishing some dealing with her.