The sheer power unleashed during Nightmare Moon's transformation and her subsequent battle with her sister, Princess Celestia, means that the newly-imprisoned mare of the night has access to magic she hadn't before. However, no matter how hard she tries, she can do nothing to Equestria from where she was; no teleporting back, no messing with weather, nothing.

So, delving into some of her newfound yet mostly useless power, the mare tries summoning things to her from across dimensions, if only to stave off eventual boredom. After many attempts, she is able to finally find something to bring to the moon, alive and enchanted to remain unharmed.

Only thing is, he's not sure if that's a good thing.