Mill of the Twelve Dead

From the publishers blurb:

Twelve Dead Make One Alive, the rhyme says.

Adventurers soon learn there is a grim truth at its core.

Far from civilization, deep within the shadowy depths of the Grimwald Forest, lies the ominous Black Mill, an abandoned place shrouded in whispered tales of dark magic and spectral hauntings.
The unwary who venture to explore the Mill must overcome its sinister perils and disturbing inhabitants: the Black Miller and its Twelve Dead, who dwell within its moldy walls...