The old Rarity was lost. She was still there, but she was mixed with a nightmare, the Nightmare Moon. The Nightmare had always lingered, waiting for a time to strike. And it did, when the Tantabus had been let loose. The two instantly merged, the personality of Nightmare Moon taking control. Using the boost in power, she sought out an appropriate host… And found Rarity.
 
Despite their differences, the two/three mixed together rather well. Rarity was so sure of herself, there was so little envy inside of her that Nightmare found it hard to stay angry. She had initially planned to use the unicorn mare’s insecurities against her, but was surprised when she found very little. Despite this, she grew to like this. She didn’t like being in constant turmoil, the fear and hatred Nightmare Moon felt with Luna was inescapable, but with Rarity she felt a tranquility she never felt before.
 
However, they felt a need to seek out power. Of course, they couldn’t stay in Equestria due to their new physical form. So they left, venturing to the Abyss to take control. The Queen of Nightmares was a fair if stern leader, taking in all monsters however ugly or disgusting. She brought species together regardless of their hatred of each other, because they knew their Queen would punish them if they didn’t cooperate otherwise.
 
The Queen of Monsters is a threatening yet well meaning mare, hopefully she can remember her friends again…  
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A collab between me and Saphi-Boo of her Wistel-Verse, the future of the Mane 6! I don’t wanna spoil anything, so I’ll leave it there ~
 
Timberwolf vector by Tajarnia