Gweogong

Lore

The name Gweogong is made up of two parts: “gweo” (괴), meaning “monster,” and “ogong” (오공), meaning “centipede.” Literally, “Gweogong” translates to “monster centipede.”

Unlike its real-world cousins, Gweogong is colossal. Paleontology even records a prehistoric creature called Arthropleura that resembled it: a giant arthropod that lived about 300 million years ago and grew up to nine feet long (2.6 m). Although Arthropleura was probably herbivorous, the mere fact that centipedes of such scale once existed lends credibility to the folklore.

A key feature of Gweogong’s anatomy is its venomous fangs (독이빨), its primary weapon. The venom is said to be extremely potent, able to paralyze animals and seriously harm even larger creatures. A bite delivers a searing, electric-like pain that can last up to twenty-four hours.

Most centipedes, despite their tough exoskeletons, are poor at retaining moisture and highly sensitive to dehydration. That biological trait likely inspired one of the most common ways to fight Gweogong—smoke. Thick smoke not only suffocates but also dries the creature out, throwing it off balance and leaving it vulnerable.

Why did the centipede become a monster? Gweogong turns monstrous after an extraordinarily long life—usually a hundred or even a thousand years. Over that span it amasses spiritual power and seeks a higher state of being: it wants to become human. In the tale of the “Thousand-Year Centipede,” the creature takes human form and lives with a man as a final test before full transformation. When the man discovers its true nature, the centipede loses its chance to become human, reverts to its original shape, and erupts in lethal fury. Its rage stems directly from that failed ascension; anyone caught unprepared can be killed.