This adventure was released as a free promo for Game Day 2006. The adventure is designed for a group of six 4th-level characters or four 5th-level characters.
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From the introduction...
Caught by a fierce winter storm while making their way over the difficult Gethinnar Pass, the adventurers seek shelter for the night in a lonely temple of Pelor. Unfortunately for them, their refuge is not as safe as it seems. Terror stalks the shadowed halls and brooding chambers of Gethin Abbey. Who will survive?