Can anyone tell me how to complete OPQ now?

There's only 4 accesible rooms now, 3 of which don't let us back in after we've gotten the statue piece. Only room we can keep going back in is the one where you have to kill 15 Lioners or whatever, and the room is empty after that. The Round portal in the middle doesn't lead anywhere, and the ladder at the bottom just leads to empty boxes.

Thanks for the help.