ocarina actually:)
I need to make sure they all only fall to their death if disturbed by the player. In my game the "enemies" are totally harmless, but touching them prevents them from giving you any magic, so you are supposed to try to avoid them.
a nice tutorial system is high on my priority list to let the player know things like that.
My favorite part of the lighting changes is how they are coordinated to the 10 minute music loop