Ki and Gil will enter this room through either the first door at the bottom-right of it (if they came from Lounge), or the second door at the top-right of it (if they came from Audience Hall). It contains one Mage, one Wizard, five Hyper Knights, and two Green Lizardmen (which take total 402 hits to kill).
The floor of the left side of the room spells out a stylised "Q"; that key at the top-right of the room opens that aforementioned second door at the top-right of the room, the key at the bottom-centre-right of the room opens the first door at the top-right of the room, and the key at the bottom-right of the room opens the aforementioned first door at the bottom-right of the room. There are no keys for the other three doors at the bottom-right of the room.
The aforementioned second door at the top-right of the room leads back to Audience Hall (Room Pass: Q39, same as Druaga's Grave), the first door up at the top-right of the room leads to Antechamber (Room Pass: SVY - same as Shunned Cavern), and the aforementioned first door at the bottom-right of the room leads back to Lounge (Room Pass: 2C9, same as Top of the Tower). You should remember the second of these Room Passes too.
