Princess Celestia invoked some of the sun’s raw powah to beat the crap out of threats too big for friendship. Doing so left her permanently large to manage the solar energies but that might not be such a bad thing, considering how often these potential world-enders appear…
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-“Relocate your alabaster rump post-haste! You’re throwing off the guards’ aim!”
Can this just be the season finale? The villain doesn’t want to play nice, so Celestia invokes the raw untapped power of the sun itself to become a beautiful crimefighting titan?