Rarity's Cat, Opalescence, is evil. Not as an adjective, but the literal incarnation of pure, undiluted evil. Rarity is sure of this. Even still, Rarity loves her little Opal all the same. But when Opal begins to quietly start suggesting that Rarity commit horrendous acts of atrocity to her friends and acquaintances, Rarity does her best to ignore her. But Rarity has grossly underestimated the persuasiveness of her cat. Her evil, evil cat.