Libra

Guess it would explain the "alicorn spell" - although Rarity ended up with flammable butterfly wings (curiously, she gets some very similar in a recent EqG short too....)

Oh, I forgot that was a thing. Wasn't there also a necklace one could wear or am I just imagining things?

There was an alicorn necklace, but I don't think it gave you wings, just creepy evil powers so yeah,  Trixie went right for it....