Forgotten Sepulchre of the Father (5E)

From publisher blurb:

A 5e Compatible Adventure for 1st-level characters by Creighton Broadhurst

Hidden beneath the tumbled, mossy ruin of a once sacred church, the Forgotten Sepulchre of the Father has lain undisturbed for 80 years ever since a night of madness and death consumed the now ruined village of Greystone. However, the sepulchre could not remain undisturbed forever. The machinations of an ambitious priestess — or the blind luck of a party of neophyte adventurers — has brought knowledge of the sepulchre once more back into the world.

This adventure is set in the ruined village of Greystone in the Duchy of Ashlar, but is easily adapted to almost any setting.