103 GREAT CAVERN. This large cavern has a relatively level sandy floor. Its ceiling height varies between twenty and thirty feet. The whole place is lit by a huge glowing boulder (about seven feet in diameter) lodged in the center of the ceiling, about twenty one feet from the floor. This weird rock exudes radiation equivalent to bright sunlight. If it is reached via a fly spell or other means, a piece can be chipped off with a hammer, etc. and will radiate sunlight as well. If handled with unprotected skin this will cause a sunburn.
Anyone entering the cavern through one of the south passages will likely be able to see the small boat at Area 103C and be able to hear the ruckus at Area 103A.