Gildagloom

Gildagloom is the name given to some sort of outsider god, allegedly responsible for the curse that will turn at least hundreds of girls from the E.R. into a particular form of Hag.

The party uncovered information suggesting that Gildagloom was responsible for the curse, but not how or why.

(from the dark grimoire) Gildagloom, a daughter of the outsider goddess Oblexx, was born around the year 200 in the age of legends, and has gone through cycles of activity and hibernation since, wiping out many human tribes and societies. She is active every 21 years for 17 years. Most of those active years are low-key, with only a few daughters spawned, but in the last 17 years of a 494 year cycle, her activity is greater than normal, with a multitude of daughters spawned... these active years usually correspond to the extinction of societies and tribes. We are at the end of the 9th cycle of Gildagloom. The 7th and 8th cycle were interrupted, and Gildagloom driven into early hibernation.

(from the grimoire of the Hag Helgith AKA the forest crone) Gildagloom is referred to as a Goddess to the Hags, and there are prescribed rituals and rites involving the sacrifice of young creatures to appease the goddess... with more time and study you may be able to learn more.