Dithparu, or "Night Spirits", was the name given to an ancient group of non-corporeal beings who predated both the Organians and the Metrons. They had evolved from physical beings, but had long forgotten their original forms and names. These lifeforms were exiled by a group of their fellow beings, called the Brothers of Light, to the Well of Souls on an unnamed planet millennia prior to the 24th century, having been deemed to be "evil, darkness, the night side of their own souls."