I was thinking of the Daedric quest for Sanguine which has nothing to do with the Brotherhood. Sanguine sends you to a party and wants you to use a spell without telling you what to do.
Tap for spoiler
The spell removes the clothes of everyone in the room including you and you have to flee the place naked to get your gear back.
It’s the Dark Brotherhood quest where you’re locked in the house with several other guests all looking for a treasure.
Ah ok. Because of the dress rules in the title, I thought it was about that one countess’s party you have to crash.
I think it’s the same quest
I was thinking of the Daedric quest for Sanguine which has nothing to do with the Brotherhood. Sanguine sends you to a party and wants you to use a spell without telling you what to do.
Tap for spoiler
The spell removes the clothes of everyone in the room including you and you have to flee the place naked to get your gear back.