Rites of Weeping

From the publishers blurb:

Deep in the woods, where the pines grow tall as churches, a god-thing is dying. Her children are gone, taken by the plague, and what was once her temple is now their tomb. In desperation, she prolongs the life of her last remaining servant, transforming her into a vile instrument of grim necessity — a yellow-eyed horror that preys upon the inhabitants of the local village.

The servant comes at night, dragging its victoms, screaming, to the black lake beneath the sodden earth. There — amid the rotten husks of plague-ravaged monks — they are caged, nourishment for a dying thing that dreamed she was a goddess.