Fifth image in the nightmare series. Again, the IDW comics have an idea that sounds great at the pitch meeting, and a character design that is really great, but the writing is ....... hit and miss shall we say. In the comics after Luna is fixed by the "Friendship Laser TM" all the mane six start having nightmares and can't sleep causing all kinds of problems. Rarity's nightmare is similar to the feelings that led Luna to become Nightmare Moon so.... she gets kidnapped to the moon by the nightmare forces, that used to be cute critters called fluffykins that crafted the dreams of equestria but they were corrupted by Nightmare Moon so she could torment everypony even while exiled, which didn't happen somehow, then Rarity gets tricked into being generous and helping the nightmare forces, but ends up getting possessed by the spirit of Nightmare Moon, which somehow still exists but then again doesn't, yaddayadda. Anywho, the plot and story has more holes than a changeling hive.

In "My Little Headcanon", everyone has the capacity to become a nightmare, corrupted by power and desire, overriding uncommon sense, and restraint. Flawless Nightmarity is still generous, she wants the world to be beautiful, for everypony to be almost as fabulous as her, whether they want to or not. After all, she knows best when it comes to this sort of thing, and evening attire is the most fabulous and elegant of all right.