The lunar surface of Crimsoon eggs is littered with impact craters, paralleling that of the sinister Red Moon visible from the Halloween Fairground throughout the month of October. A devious childlike laughter will oftentimes be heard echoing in the distance upon a Crimsoon egg's discovery. The source of this giggling taunt remains unknown and anyone who attempts to trace the sound to its origin is met with a terrible fate.
Crimsoons are celestial objects not too dissimilar from the likes of Tenalps and Yewefoh. They seemingly communicate via the same stardust language found to be shared amongst various other cosmic species.
An ancient mural discovered deep within the caverns of the island's Volcano illustrates the tale of a legendary hero, whose name has since been lost to time, that prevented an extinction-level cataclysm when the Red Moon threatened to crash into Ark. By awakening the the slumbering spirit of the Volcano with a primitive wind instrument, the hero summoned forth a massive eruption which collided against the falling satellite and sent it back into orbit. The Crimsoon species was birthed from the Red Moon's fragments in the shattering aftermath.