Against the Cult of the Reptile God Advanced Dungeons & Dragons (1st Edition) (1982)
From the cover:
Terror by night! The village of Orlane is dying. Once a small and thriving community, Orlane has become a maze of locked doors and frightened faces. Strangers are shunned, trade has withered. Rumors flourish, growing wilder with each retelling. Terrified peasants flee their homes, abandoning their farms with no explanation. Others simply disappear...
No one seems to know the cause of the decay - why are there no clues? Who skulks through the twisted shadows of the night? Who or what is behind the doom that has overtaken the village? It will take a brave and skillful band of adventurers to solve the dark riddle of Orlane!
This module is designed for 4-7 characters of first through third levels. It includes a map of the village and a description of its buildings and occupants, an overland journey to a challenging underground adventure for especially brave (or foolhardy...) characters, and a list of pre-rolled first level characters.