Talk:Do Princesses Dream of Magic Sheep?/@comment-26538816-20150628170619/@comment-26973802-20150701181320

I don't usually comment here anymore but I'll say this just to make it clear:

We don't know whether the Tantabus is the "outside force" that magnified Luna's jealousy to turn her into Nightmare Moon, but there is much speculation that it is. Nor do we know that it will turn Rarity into Nightmare Rarity. It's possible they might do subtle references to the comics, though the show probably won't do anything to confirm their canonocity.

In the comics, the Nightmare Forces were the inhabitants of the moon corrupted by the true Nightmare, an evil entity of darkness who possessed Luna, and later Rarity, a completely separate entity from them, who took advantage of the former's jealousy and the latter's insecurity to manipulate them into letting her in, and is killed by Spike.

In the show, Nightmare Moon is Luna corrupted by her jealousy, as confirmed by Lauren Faust in the Elements of Harmony guidebook, though an outside force did have a hand in her transformation, which was shown onscreen in flashback.