Spirit of the Tree of Ages

 is the very essence of the Sacred Tree of Ages itself from both timelines. It had remained dormant for the entire anime of InuYasha.

History
To be added

Personality
Being infinitely wise and knowledgeable, it also seems to have acquired a bit of Lady Kikyō's personality as it has taken on her form to commune with Sesshomaru, and his twin daughters and niece.

Physical Description
It has no known form but has since borrowed the form and voice the late priestess Kikyō.

Relationships
To be added

Media Appearances

 * Episode 4 (Hanyō no Yashahime)
 * Episode 8 (Hanyō no Yashahime) (dream)
 * Episode 18 (Hanyō no Yashahime) (flashback)

Trivia

 * In the Avatar franchise, there is the ancient Tree of Time of the Spirit World, where the very first Avatar, Wan, had permanently merged with the mighty Spirit of Light and Peace, Raava, who was then transformed into the Avatar Spirit. Avatar Wan had then imprisoned the Spirit of Darkness and Chaos, Vaatu, inside its hollow for the next ten millennium. The Tree of Time remembers everything in existence.