A door that not even the royals know what lays behind. The only who one who has ever been seen going inside is the King. Occasionally. Every time he emerges from the room, he comes out with an unpleasant scowl on his face. No matter how much anyone pesters him about what is hidden behind this door, including his own children, he has never shared. It is like his hand needs to be forced to show what is behind the forbidden door.