Undead Month - Day 7

This room is empty aside from a pedestal in the very centre, a mirror on the southern wall which provides a real-time view into Day 6's room, and a brass plaque on the northern wall. The pedestal holds, wrapped up in a locked skeleton hand, a key made from a finger bone. This key unlocks the door in Day 6's room. Any attempt to brute force the lock open or pick it causes the hand to grip the key tighter. On the 5th attempt the key snaps.

People and objects can pass through the mirror into Day 6's room, all the time the door in that room is locked, but nothing can pass back through into this room.

The brass plaque on the wall is split into 4 sections, below is a diagram resembling the plaque's decals:

Of the bones scattered on the floor, 4 can be used as keys in these keyholes. They are easily identified by their shape matching one of the 4 suits. The letter A in the square windows beneath the keyholes can be changed by turning the correct key in the correct keyhole. The A changes to a 2, then a 3 and so on in the order of a playing set ending in J, Q, K. Turning the correct sections to match the passphrase mentioned by the statue's in Day 6's room releases the key from the hands grip. The correct solution should look as follows:

There is a door on the eastern wall that leads further into the dungeon.