I remember doing this quest a while ago and I'm trying to remember the details.
I think it was a delve in an AD zone. There was a bosmer... I think he was an alchemist. He was stuck in a daedric illusion where he was happily married to his true love even though she left him in real life. The daedra keeping him in this blissful illusion was feeding off him the whole time, and you had to choose whether to let him stay in blissful ignorance or wake him up and banish the daedra.
Anyone remember what daedra that was? It seems like a vearmina thing, but I remember spiders so maybe mephala related? Maybe it was some minor daedra? Any help is appreciated, thanks!