Every time the Nightmare Forces possess a pony, and that pony is cured with the Elements of Harmory, it creates yet another misunderstood half-demon pony so that more fanfic can be written. First Nyx, then Dyx, and now, if Pony Quarantine is to be believed…
(caution: vulgar, possibly NSFW)
>oh noes, it's Nightmare Apple
>"The apples will last forever! Moohoohahahahaha!"
>"What does that even MEAN?"
>"Never mind that, hit her with the Elements!"
>"Do we even still HAVE those?"
>BZZZZZZZZZZZZZZZZT goes the Rainbow Brainwash Laser & Electroshock Therapy Spell
>"Girls, what happened? And where's mah hat?"
>"Who are you, and why do you have mah hat?"
>"I'm Hyx. Hyuck!"
>"Are we gonna create a new misunderstood demon pony every time somepony gets possessed by the Nightmare Force?"
>"Looks like it."
>"Gimme back mah hat."
>"Fight ya fer it! Hyuck!"
>such is life in the Zone