You appear in a small room with three doors and a portal back. Only the wooden door (to the north) can be opened manually, the others will have to be opened via switches. Open the northern door to enter a room full of Dark Bishops and a switch at the opposite end. Pull the switch, and an ascending flight of stairs will rise on the western wall. Beware of the Ettin that appears at the top. The stairs will take you to a balcony overlooking a large chamber of lava, along with numerous Afrits. After defeating them, you'll have to jump down to the lava to proceed. Directly to the right/north of the balcony, there is an open stairway - quickly make your way there. You'll find a larger balcony with a few Dark Bishops, a Quartz Flask, and another switch. After pulling it, go back down to the lava