Black Rainbow

The Black Rainbow was a cosmological phenomenon that occurred shortly after The Mage War came to an end with Wilhelm Ryan's victory. There has only been one known occurrence in all of Heaven's Fence.

Features
Similar to a regular rainbow, the Black Rainbow was a band of light (or lack thereof) that raced across the sky of Heaven's Fence. Unlike a regular rainbow which stayed only within a specific planet's atmosphere, the Black Rainbow spread across the whole of the Fence. This made it cosmological event, rather than a simple meteorological one. Also unlike a regular rainbow, the Black Rainbow did not have a perfect trajectory as the colors of light do, but rather had an "inky" quality to them, as though someone used a brush to paint the band and the ink bled out of the confines of the norm.

The phenomenon didn't seem to have been caused by anything in particular, and didn't seem to affect anyone or cause any harm while it was prevalent. It lasted just about one year and disappeared in much the same way that it came: quietly and without warning.

Meaning
As no one had ever seen a Black Rainbow, many people in The Fence took the phenomenon as a sign from God; for some, it was a sign that Ryan was the true ruler of the Fence (an endorsement, if you will), while for others it was a sign of God's anger at Ryan's victory (a condemnation). Ryan himself was indifferent. The Prise, who were tasked with looking after the Keywork and the skies of the Fence, took the sign as an omen and set to work to do something about it.