So yeah, I'm thinking this new trick of "channel hatred and fear at things" is a power Princess Celestia's going to be wanting to keep a lid on.
Also, let's face it, it gives a decent reason not to want to send Princess Luna. I love you sis, you mean the world to me, let's just not put you in a situation where you're going to be required to access your reserves of hate and anger for power, hmm?
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