It is Luna and Celestia's older sister who turns against star-swirl the bearded because she believes that he is poisoning her and her other sisters minds with the friendship of magic she then tries to kill star swirl and instead turns him in to a tree the tree of harmony and he lives in that tree for a really long time when astelle gets revenge many years later by using Trixie to do her bidding and capturing her two younger sisters and trying to get Luna to join the bad side again with her she doesn't succeed in getting Luna on her side and instead turns the disguised Trixie into the nightmare twighlight sparkle and her new goal is to destroy the tree of harmony otherwise known as star swirl the bearded in mlp fanfiction Princess Trixie Sparkle
Celestia:Astelle please don't do this Astelle:it's too late now my dear sister Celestia