Realizing that Discord could still get out someday, Celestia tries to reason with him. Sending the elements of harmony on their newest mission, their goal is too try and change his chaotic ways. However, he has a few things he wants too say as well. Also, the tags don't fit the story too well, if I could chose I'd probably say "thought provoking" is a good tag for it, and it's sort of dark/sad.