The concept art here was, once again, created by the talented Jeff of Jeffchendesigns. These massive subterranean grubs primarily prey upon farm animals and pets, but have been known to consume children and young adult humanoids given the opportunity.
Ouroboros Grubs trap their victims by snatching them with their tentacle-like appendage, rendering their target catatonic within seconds due to the spines injecting a powerful paralytic agent. The victim is then swallowed whole, triggering the glands on the underside of it's mouth flaps to release a digestive acid that breaks down their meal slowly over the course of a few hours.
Their hide provides nominal protection from potential predators as it is a hardened layer of self-replacing chitin. That is, the grubs produce more chitin with each meal--essentially turning their fecal matter into body armor.
With each feeding eggs are produced. Over the course of their one to two year life span Ouroboros grubs will produce upwards of 30 eggs. Toward the final months of their life-span grubs will burrow 15-20 meters beneath the surface and create a nest. Once safely residing within said nest they enter a hibernative state--conserving nutrients from their last meal.
During this sleep cycle the eggs contained within the body of the grub begin to swell and hatch, eventually causing the grub to burst open unleashing upwards of 30 perfect--if somewhat small in size--copies of itself. These newborn then consume the nutrient-rich remains of their progenitor over several days--remaining within the nest until they are capable of defending themselves.