This story is a sequel to The Moon Shall Rise From Hell's Ashes

It has been approximately a year since Dill Anne Shear took on the form and powers of Nightmare Moon. During that time, she has used those powers to seek out fragments of the Nightmare that fed on the hatred and negative feelings of other ponies. She took on those energies into herself and has been helping calm the darkness into tranquility. But as good as she has been in this life, something managed to escape from her new home world... something that would prove too unwieldy for her alone.
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For several years, Shirayuki has shared a body with Tundra. While they are the same pony, events of the past separated their minds. To combat enemies whose powers went beyond magic, they and their friends gained new soul-based weapons and powers. But in destroying Discord, they might have unleashed an even greater foe.
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Returning to his daily routines proved difficult for Changeling Drone #51. His stay in that other world opened his eyes to how to feel the very emotions that his kind feeds on. Old instincts drove him to work emotionlessly, yet his recent experience told him to take care in everything he does. Discovering a traitor in his hive was the last thing he wanted to worry about.
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Three dangerous entities that were thought to have been destroyed ended up at each other's backs. This happenstance created a monster, grinding parallel universes into each other. Now it looks like the hope of all of the worlds rests in the hooves of a Nightmare pony, a split-personality alicorn, and a changeling. Anyone else worried?
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The Moon Shall Rise From Hell's Ashes, Nothing Probably Goes On Forever Too, and Extraterrestrial #51 were all written by yours truly. MLP: FiM is property of Hasbro, DHX Media, and currently the Discovery Family network. Additional inspiration was drawn from Mortal Kombat vs. DC Universe. This is a non-profit, fan-written work of fiction.
Rated "T" for "Teen".