INSIDE: Spectrum

An anomaly is spreading itself around Equestria. The only horror about it, is that not a single pony knows it exists. It goes around, trying to find a host to infect and take control of. There are no know symptoms of this unknown anomaly, so no pony knows what could happen to those infected. But, you can expect that soon, one pony will know. This pony will have to go through the possibly fatal symptoms of this happening. They will have to deal with the lasting pain this virus could bring upon them. Just know, that the symptoms will not be the same for all subjects. Some may experience different outcomes of this infection. Whether or not it's dangerous to just the victim, or to any pony around them, until this anomaly can be demoralized at the source, a pony will always have to die. Casualties may be high to this disguised attacker
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Who knows if it will cause vivid dreams, instant death, contagion... Or insanity.