Nightmaring

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
by Clear Quill August 06, 2011
mugGet the Nightmaringmug.

Sparkling

Sparkling: Unleashing a part of yourself that you normally keep contained
When the sonic rainboom reached Canterlot, Twilight started Sparkling.
by Clear Quill August 06, 2011
mugGet the Sparklingmug.