My friend, not yours

"Ah, my child, born to do wrong in the world," rasped Nightmare Moon, who had by now separated herself from Luna entirely. "It is time, and fitting, that you should take you true form. Let me help:

Midnight, nightmares,
Moon and hatred.
Mixed together
In a combination.
Throw away
The pixie dust.
Time to take
On your nightmare lust.
Storms, battles,
Lightning, moon.
Time to wreak havoc
Very soon.

Ha ha ha!" Her laugh echoed around the barren castle. "Soon, you will come, with an entire army behind you."

Miles away, in a jail cell, Nightmare Storm awoke.