What happens when a bounty hunter from another plane of reality is thrown into a land of pastel ponies?

The Pulse had been heard, warning of the Return, the Fall, the Rising of the Three.

"In a world of whispers, what can you hear?" -Shadow Storm

Trixie has come back seeking revenge on Twilight Sparkle, and this time she has a wide variety of spells to use against her! What will come of this inevitable battle? And what will Princess Celestia do afterwards? A