Princes of the Apocalypse Supplement
From the introduction:
Nearly 4000 years ago when the dwarf kingdom of Besilmer stretched clear across the Dessarin Valley the hill dwarves erected wayfarer shrines to their god of wanderers, Marthammor Duin.
Now, as Elemental Evil continues to attract monstrous beings to the ruins of Tyar-Besil, some opportunistic lesser demons have crept through the lower planes to corrupt these shrines.
For 5th - 7th level characters. The module is provided in standard and printer-friendly format, varying only in the lack of a page background. Two PNG files also are distributed with the module - a full size dungeon map, and a "journal fragment" handout for pint-and-play use.