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Residence Dreams

The Tantabus is a dark and parasitic magical force that turns dreams into nightmares and the secondary antagonist in the first and second seasons of The New Adventures of My Little Pony: Friendship is Magic. She serves as the main antagonist in the episodes The Rise of the Dragon Twilight and Do Princesses Dream of Magic Sheep? 2. She is a manifestation of darkness created by Princess Luna to punish herself for the things she did as Nightmare Moon. She resided in her dreams and gave her nightmares, such as her turning her back into Nightmare Moon. But then in one such nightmare, the Mane 7 arrived and attempted to turn her back with Rainbow Power. Having gained enough power from Luna's nightmares and learned the existence of Princess Twilight Sparkle & Prince Spike, the now self-aware Tantabus teamed up with Dale Williams, and together, they escaped into the dreams of Princess Twilight & Prince Spike, giving them nightmares and making them seriously ill. Afterwards, she saw Dale was utterly useless and joined forces with Nightmare Moon.