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In fact, I wonder whether her power is related to her people. SBefore she disguises herself as cadance and absorbs shining armor's love, she can even defeat Cadance,a princess.But since she was usurped and lost the support of her people, her magic has weakened and was almost killed by mean twilight. In this episode, she is the enemy and threat of all creatures in the world, including her former subjects. She is deeply hated by everyone . For a creature that feeds on love It should have a great impact on a former queen. At the same time, although spike and rarity are weaker than her, they show her the power of friendship and love, so it's not surprising that she has the upper hand in this battle (I'm not a native English speaker, which is the general meaning)