Nightmare Rarity

Nightmare Rarity is Nightmare Moon's sibling and the third main antagonist in the series.

Appearance
Nightmare Rarity is significantly taller than regular Rarity. Her coat is dark purple and her Cutie Mark is a modified version of Rarity's cutie mark, featuring stars and glimmer. Just like Rarity, her mane is groomed in an elegant hairdo, but hers is much longer, multicolored and somewhat etherealized, star-like glitters can be seen within her mane. Her eyes are a pale cold blue, with vertical pupils, and diamond-like glimmers can be seen within.

She sometimes wears crowns, usually incorporating crescent moons and diamond symbols. During her invasion of Ponyville, she wears a golden and very tacky version of Nightmare Moon's armor, featuring a high collar and engraved with a lot of jewelry.

Personality
Nightmare Rarity's personality is very reminiscent of Nightmare Moon's. Very little is left of Rarity, though she keeps her love of fashion (as can be seen with her battle armor) and is very vain. Nightmare Rarity is a villain through and through, cruel and sadistic, delighting in bringing enemies down and humiliating them.

While she can be manipulative, it is mostly only to toy with enemies - primarily, she relies on her army of Nightmare Forces to get her way. She does not often engage in battle personally, though when she does the results are usually devastating for her enemies.

Powers and abilities
Nightmare Rarity wields a great amount of dark magic. Offensively, she is so strong that a single blast from her was enough to take down Princess Luna (although it should be noted that Luna was at that point holding herself back out of fear of becoming Nightmare Moon again).

Nightmare Rarity, true to her name, has the ability to manipulate the dreams and nightmares of others, creating vivid illusions. She was almost able to trick Spike by posing as regular Rarity and offering him a place by her side as King of the Nightmares.

Nightmare Rarity is also very strong in The Dark Side of The Force, since Nightmare Moon was her Sith Master. And like King Sombra, she weilds a Darksaber.

Main Weaponry

 * Darksaber