Tormented by the implications of her apparent immortality, Twilight Sparkle asks Discord for the painful truth. Instead, he gives her a complete answer.
"And here you'll see the statue of the Lord of Chaos, Discord, imprisoned in stone." A tour guide tells the story of how the reformed spirit of chaos slipped into stone for the third and final time.
Years have gone by, and Smolder comes to the unsettling conclusion that her friends are running out of time in this life. But Smolder considers her friends to be her hoard, and a dragon and her hoard are not so easily parted.
Aria Blaze hasn't done anything since they lost their magic at Canterlot High and were found by Sunset Shimmer. She simply doesn't feel like anything is worth doing... which leads her to wonder why she's still here at all.
Wings. A title. Responsibilities. A relationship with Luna. Twilight Sparkle has gotten used to a lot of things since becoming a princess. But there is still more out there for her to learn. Most especially in regards to her marefriend.
I have heard ponies say that living so long would be a curse. That it is a burden. That it can break a pony's mind. There is some truth to that, but it's not the whole truth.
On Remembrance Day, Equestria stops to look to its past to better preserve it for the future. It's a good day for everypony - or at least it is for those who will one day become memories themselves.
The princess decides to pay a visit to the castle she once called home. When her student comes looking for her, she decides to open up to the younger pony, leading Twilight and Celestia to a conversation regarding the consequences of their lifespans.