This is the third room in game to be divided into two sections. Ki and Gil will enter through the first door at the left of the left section - which contains three Wizards and eight Blue Snakes. If Gil had collected the Fork, he will again be able to deflect the Magicians' spells back at them with his sword.
The key at the top-right of the left section opens that door at the top-right of the left section, the key at the right of the left section opens that second door at the left of the left section - and that key at the bottom-left of the left section opens that aforementioned first door at the left of the left section.
The door at the top-right of the left section leads to the right section (Room Pass: still 7C9), the second door at the left of the left section, like the one at the top-left of The Staircase, leads to Holy of Holies (Room Pass: S3Y), and that aforementioned first door at the left of the left section leads back to Priest's Quarter (Room Pass: D39). If Ki and Gil went through the door at the top-right of the left section, they will re-enter through the door at the centre of the right section - which contains no enemies at all and is possibly the smallest room in the entire game. The sole key at the bottom of the right section leads back to the left section (Room Pass: still 7C9). The room that the second door at the top of the left section leads to is impossible.
