Laboratory of the Beast - Part 9: Lower Level (Areas 1-10)
GLOWGEMS: The vast chamber is filled with an eery, silver, sepulchral light emanated from countless small glowgems in the ceiling. The glowgems magic is failing with age, but each would still be worth 5 gp. (There are a total of 600 such gems, although prying them out would be a major undertaking.)