The Swamp Stalker originated from the ancient spawning grounds disturbed by upstream construction, emerging as a guardian of the swampy territories where creek waters meet land. It was born from the fusion of decaying plant matter and supernatural fog, evolving into a predator that defends its domain against intruders.

Swamp Stalker possesses a semi-aquatic form that allows it to move silently through water and mud, with enhanced senses to detect vibrations in the fog. Its body is resistant to environmental hazards, enabling it to thrive in low-visibility conditions and withstand the creek's pollutants. It can blend into swampy backgrounds using natural camouflage, and its slow, deliberate movements make it nearly undetectable until it strikes.

Swamp Stalker patrols the swampy edges of the course, creating zones of heightened danger where players must avoid disturbing its territory, and escalates tension by appearing during foggy rounds to emphasize territorial conflict.