Somebody who actually has been in the palace the last few days, internally screaming forever after the manner of competent intelligence officers dealing with other people who are not competent intelligence officers, recites the basics:
If something nice happens to you that people in non-Chelish countries would throw some kind of fucking party for, a girl is already there and already has a cake to offer them.
It's actually pretty good cake.
Nobody knows what happens if you refuse to eat it.
The cake girl doesn't give a shit about Forbiddances or wards on the room.
Nobody has spotted her teleporting.
Oh, and also the cake girl is one of the Project Lawful girls etcetera etcetera so she presumably has arcane vision, casts cleric spells, her soul's price in the markets of Dis is astronomically high, may possibly be Abrogail Thrune, got transformed prettier after she joined Project Lawful, etcetera etcetera.
That's the main line of the rumors, there's too many variant versions for anybody to keep track of.