Talk:Twilight's Kingdom - Part 2/@comment-26973802-20140414043016/@comment-10390252-20140414085936

Ghost is basing this on the revealed artwork of the cover of the 'Keys of Friendship' DVD. I suspect that the crystalisation is due to the nature of the Tree of Harmony.

I speculate that this artifact and the Crystal Heart may have a common origin and, as both Rainbow Ponyville and The Crystal Empire are empowered by the same type of artifact, they would have a similar appearance. That's only a guess at this point, though. It's possible that only Twilight's library tree will be affected this way or, it is just as possible, this is a whole new location created by the Tree when the Chest is opened.

We still have a lot to learn!