Nightmaring: Bottling up your rage/fear/sadness/regret/etc. to the point where you explode, doing something that you would never normally do.
Luna, in becoming Nightmare Moon, was one of the first recorded examples of Nightmaring
Sparkling: Unleashing a part of yourself that you normally keep contained
When the sonic rainboom reached Canterlot, Twilight started Sparkling.
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