Heavensrift

The Heavensrift is an event that occurs every moonless day. It is announced by the dark skies splitting open, making way for a blinding light as angelic-like creatures come down. These creatures are the cherubim. They come down from the heavens to absolve humanity of their sins. In other words, they kill humanity, turning them into lesser cherubim. It is not known how the cherubim choose their targets, yet the citizens of the central district seem to be safe from them.