Never Say No to Rarity

Whilst restocking potions at Sugar Cube Corner, Potion Nova runs into Rarity. Rarity insists Potion Nova gazes upon upon her gems. She makes Potion Nova regret ever declining her offer.....
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Potion Nova is written as an alicorn in this story as opposed to being a unicorn. She was originally shown as one in the show and I honestly think it's wasted potential that she wasn't one.