Cave Ayahuasca are a plant type necromancer found throughout certain areas in Eye of the North. They specialize in curse magic, specifically anti-weapon using characters. It is recommended that these are taken down quickly if your party consistents of those type of characters or bring ample hex or condition removal.
Ayahuasca is probably a reference to the actual preparation in which the plant matter of specific types of herbs is brewed and ingested in order to experience a psychedelic trip.
