A mirror that kills pony? No silly, but it had to be somepony who able kills pony without leaving no trace of them?

Evidence found mirror covered in pony bloods. Also, it was infected by something strange and rare. Also, found half-eaten pony and not either soul too. It's like there something is cannibalism and devourer pony.

No one never ever found alive. Clue leading nowhere to the culprit.

Also, my first FanFiction Story.