The Tree of Harmony has gained the ability of verbal communication, though it speaks to a select few. One these few now includes a mysterious being who goes only by the name of The Doctor, an alien who travels throughout all of time and space and has lived longer then both alicorn princesses. They have a chat about loss and immortality; what they have meant, and will continue to mean for both of them.
I don't think she would be a villian, I think she would be like she is in Remembrance
is there an AS in the story ?
9195281
An "AS", what?
9196743
EveryOne
9196773
Oh no.... well this embarrassing, I will remove it from the group
In response to your request of constructive criticism, there's not much to say here story-wise because it's so short and simple. My initial note was wondering why the Doctor even came here, but that gets cleared up by the end, so it's no issue. All that's left for me to comment on is recommending a final pass or two of punctuation and a bit of spelling editing (missing/extra punctuation, misplaced spaces, using word soundalikes instead; both from systemic errors and one-off typing mistakes). All in all, a good small showing.
I refuse to believe Twilight Sparkle would ever become a villain. She is far too caring, benevolent, modest, and has too much sense of responsibility to do such a thing, whatever life may throw at her.
Of course, in my headcanon neither she nor Cadence are immortal, so...yeah.
TARDIS
It looks like the tree of Harmony has its own name tag you can use