Howling Halls (Pathfinder)

From publisher blurb:

Four PCs of level 7

The PCs may encounter this minidungeon as part of a larger underground complex, or they may be employed specifically by a local power in order to clear this den of undeath.

This cold stone crypt is unlit (except in the three central chambers), and only creatures with a light source or darkvision can see into its depths ; it is advisable
that the PCs keep moving – prolonged exposure to the numbing cold here will eventually lead to frostbite or hypothermia, unless the PCs are wearing warm clothing, or have access to the appropriate magic.