Misc Thoughts During A Rewatch Of The Season 5 Opening · 6:41am Jul 13th, 2017
"I bet there's some sort of horrific monster behind it."
- Rainbow Dash, Element of Accidental Honesty
So, I'm going to assume that it was the harmonic magic inherent to heartsongs/spontaneous-and-not-quite-spontaneous musical outbreaks that took the creepy Orwellian subtext in "Our Town" and turned it into plain old text.
Hypothesis: the last timeline, the burnt-out wasteland with no visible life anywhere, from the season finale? That's the one in which Starlight got her way and brought her equality cult to the whole of Equestria. Given the way her limiter hexes seem to work (nopony can be better than the worst pony at anything), slapping a couple of those on Celestia and Luna probably made the sun and moon fall right out of the sky. Oops.
Seems like a reasonable hypothesis. They were kind of running out of villians at that point. My hypotheses for that scenario are threefold:
• Starlight not thinking things through
• Trixie never removing the Alicorn Amulet and bringing about her wheelless paradise (and incidentally killing everything. Somehow.)
• Sunset Satan destroying the mirror portal behind her as she returns to Equestria, which does decidedly unpleasant things to both worlds.
Of course, I'm not sure if Equestria Girls is even a thing in the Pony-Eldraeverse, so there's that.
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I had assumed not so far - subject to better ideas as I go - as the terms of the fusion get awkwardly hard to hold up with another world of colorful hominins out there, even if I salt with copious alternate-universality and assume they're colorful pointy-eared hominins.
On the other hand, and assuming that Star Swirl never counted on anyone trying to use the mirror from the physiologically opposite side to usual:
Cordelia Vintar-ith-Vidutar, personal log:
Today I fell through a mirror, turned into a small colorful horse, and was hugged for seven straight hours by someone who appears to be the local analog of Fluttershy.
...even with the usual Exploratory Service offset, this must be what going mad feels like.
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"But, Fluttershy hugs!"