If not, go out to random locations until Dragon Boi appears, win and he drops a Jade Talisman. Pick up all 15 pills to trigger another fight in the middle of the new rooms (this nets you the 5 Coloured Pearl, the real treasure for first time around). Not sure what stage you are at and not sure exactly which one does it, but to complete it just go through the hidden cave (circle the first floor a few times since the map is a little funky, just keep taking new paths if they appear), go down, beat the Dragon Boi, pull lever and go into the newly revealed chambers (you can see it on the map).
