Designed for BX rules for characters levels 3-7. The ruins of Wereskalot stand harboring a mystery in need of solving.
from the Introduction:
This adventure is the conclusion to that introduced in the Expert Adventure Supplement XS1: Luln. As such it is intended for higher level characters in the range of 3rd to 7th, inclusive. It is important that the party include at least one cleric (possibly more) and a halfling. It is designed for use with the 1981 Basic & Expert Rules edition; with minor modifications it can be run with the Holmes Blue book rules, and even Original or Advanced D&D.