Ah, the Rainbow factory. A certainly very horrific, and truly awful facility in cloudsdale. Thus this facility may have it's most horrific ways of making rainbows, by extracting it from innocent ponies that failed their flight test, it sure is a unique way of making rainbows.

But yet that it has been up for over 1,000 years, the facility does have to get recleaned, and some parts even have to be closed down for once. With this, from 100 years ago the facility was re-made, and newly refreshed into the facility we know of today. Parts were closed off and to never be re-opened, the baserment maze was closed off because of it's unusuable sides, and the risk of getting lost inside there was a highly taken risk, to say the least.

But with all the old things, comes also bad memories. Many workers that has been into the circulated areas around the closed down ones, has heard mysterious growlings, screams, scraping and all sorts of other sounds.

Someponies who has gone down to explore those areas, cease to never come back up ever again. Those who does come back, are badly injured, and some injured so bad they die within hours after the injuries.

What is causing all of this? And how can it be possibly stopped?