Rock Hock
Candicorn-art
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Rock lives in a dojo outside Canterlot in it's thick forest.
Starseeker and Sparkle stumbled upon her once when searching for a falling star. Starseeker had made a bad landing, getting seriously hurt from a tree. Thankfully, it was near Rock's dojo whom found her in the forest and nursed her back to health.
They had been friends ever since.