Discord and Moondazzle, two Mega Evolved pokemon, find their way into Equestria. They're both famous for killing gods, and now have their sights set on Twilight Sparkle. However, it seems Twilight will be a harder kill than they're used to, and to make things worse they've been sentenced to reformation at the School of Friendship.
Violence and profanity just in case this gets out of hand. Death because the story has a killing theme.