Day 32 - What's that?

Night 3, Yesne Brightstar sees something. Bjorn Lovehammer casts detect sense. Most evil thing he’s seen/felt. My knowledge - want to see the virtuous turn to villainy. Want everything to turn evil / corrupt. Once creatures of the material plane but their foulness saw them exiled to the planes of Hades where they degenerated into true fiends. Some know them as Night Hags. Very powerful. Ability to enter and exit the material plane via the ethereal plane (can plane shift).