The butt-plug darton split from its ancestor, the hexdigger. As the stisnite began preying on the hexdigger, some hexdigger, being scavengers, inevitably began preying on the remnants of their fallen brethren. Some specialized, and learned to use the carcasses as bait for their unsuspecting predators, now made into prey. Eventually they spread, taking to a parasitic lifestyle on all varieties of quefts. It will either hide near or in a carcass, or in a patch of airbulbs, and use its body to "spring" into the anal hole of the quefts, sensed using its chemoreceptors. Most of the time this will fail, but once it does succeed it will turn its front set of teeth backward, anchoring it to the queft. Over time, it will move further and further into the digestive tract, causing hemorrhaging and digesting feces and blood from its host until it kills it. It will then proceed to die, releasing hundreds of young into the newly formed carcass, starting the process anew. It has grown smaller, now only numbering two to three millimeters long.