Daughters of Erictho
The Daughters of Erichto is the name for "wild" Witches of Thessaly. They are a pagan tradition practicing Chthonic Magic in the name of dark Faerie gods, although their magic also seems affiliated to the Magic Realm. They are believed to practice at least some Infernal magic.
The Daughters are described in Realms of Power: The Infernal page 140-143.