Spirit derives from Japanese mythology.
Yamanba (or Onibaba) is a kind of Kijo: were once human, but were corrupted and transformed into monsters.
Her true form is as a tall old woman, 2-3 meters (around 7-9 feet) with gleaming eyes, a wide mouth split from ear to ear, and long messy white hair. In many stories she has fangs and horns in her true form as well.
But she also has some transformative powers and may appear as a beautiful young woman pretending to operate an inn for weary travelers. Or perhaps, a gentle old woman offering a place in her home for the night to lost people in the mountains. She has a raging appetite and in most stories, eats everything the victim has before eating the victim him/herself once they are asleep.
Forbiddens are very aggressive that can attack everything - including summoner and allies.
Summoning ingredients requires: Henbane and Alder Cane