Please Help me with this everypony! :( · 5:37am May 2nd, 2012
Okay, so heres the thing.
I have a fanfic in which my OC Horror Storm gets a magic ball from Nightmare Moon (in one of my unreleased, unmade fics, she is brought back to Equestria) and he sets up a simple, two trigger trap that hits Storm with this ball.
Now this ball is like an air-filled one, but it's pretty much indestructible, and it causes a random personality to surface, the stronger the personality, the more likely for it to surface.