[LN] Loki gonna infiltrate the ball as himself, using "I'm the God of Mischief so I fit in perfectly with mischief makers like you" and "I own a home in a fae realm" as justification for his presence. absolutely no lies! he'll just. hide his murderous intentions until it's time to leave. or if he can get away with killing someone at the ball
Hahaha incredible
he figures they'll be able to tell that he's not lying about owning a piece of fae property (which, IIRC, he got by terrorizing the minor fae owner into practically giving him)
he might rescue other Guardians by teleporting them away and saying he sent them somewhere unpleasant
(maybe to a bathroom, so it's technically true)