>Twilight realizes that Luna's transformation is a vision of the past caused by Zecora's potion. Further flashbacks allow her to witness Celestia and Luna's discovery of the Elements of Harmony at the mystical Tree of Harmony in the Everfree Forest. Twilight and her friends enter the forest with the Elements, believing the tree to be in danger. Twilight is soon sent away by her friends as they grow concerned for her safety, but rejoins them after Discord mocks her for putting herself before her friends. Finding the tree entangled by evil vines, Twilight deduces that it needs the Elements to survive and returns them to the tree, eradicating the plants and freeing the princesses. The tree then sprouts a flower containing a chest with six keyholes, mystifying the ponies. Back in Ponyville, Discord admits to sowing the evil plants shortly before his original defeat in a delayed plot to plunder the tree's magic; he claims to have deliberately withheld this so Twilight would learn how to be a proper leader. The Summer Sun Celebration then commences, with Twilight participating before her cheering friends.