Tree of Harmony

The Tree of Harmony, also known as Magicae Animus (Latin; Magic Mind), is a member of the society known as Magic, as well as a multi-dimensional being who, while manifesting a presence in the lower dimensions, takes the form of a large tree in the Everfree Forest. It is very powerful, rivaling the combined might of the ancient races in terms of raw power - though it can only harness a fraction of this power in the material world, most of which is used to suppress the corrupting influence of the Void that is centered in many of Animalia's wild forests.

History
Due to the fact that the Tree exists above time, it has not only lived through every timeline, but can also see every possible future. As such, it has on multiple occasions lent its power across multiple timelines to Crimson Nightmare, Princess Celestia, and the Mane 6 in a long-standing effort to save the world from Malevolence. Knowing that the Elements were necessary for events to play out the way they did, and that both Twilight Sparkle and Wander would use time traveling magic in an attempt to correct past events, the Tree continued to lend out its power to both lead to Twilight's resealing of Malevolence, as well as the breaking of the dimensional wall between the Animalia Dimension and the Copy Dimension. The former was the buy time so that Crimson would be able to return, while the latter was primarily to enable Losty and Ruby to appear, thus garnering the Changelings and the Diamond Dogs as allies in the ultimate battle against Malevolence.

Thus far, the Tree has had a large impact on every timeline's history, including lending out the Elements of Harmony, bestowing Rainbow Power on the Mane 6, suppressing the corruption of the Void, and gifting Twilight Sparkle the Rainbow Friendship Castle.