Theory CONFIRMED (more or less) · 6:59pm Sep 30th, 2016
You know in my last blog I said something about a sinkhole? well now here more elaboration. The tree of harmony is growing IN the hole! While the elements are inert in equestria the are active on the other side. In my headcannon it was active for the last 250 years (1 year human side equal 4 in equestria) barring the summer before Sunset stole the crown (the year between Nightmare Moon's return and the plunder vine incident.) then when Princess Twilight gave back the elements to the tree the girls in CHS started to pony up on their own. The magic leak itself done through "cracks in the fabric of the universe" as Doctor hooves would say.