The Swamp Scourge originated when toxic runoff from upstream construction seeped into the creek's swampy fringes, mutating native flora and fauna into a single corrosive entity. It emerged from the polluted muck as a manifestation of the wetland's vengeance against human intrusion, now lurking in the murky waters as the fog thickens.

The Swamp Scourge possesses a semi-solid form composed of decaying organic matter and polluted water, allowing it to ooze through swampy terrain and dissolve obstacles. It emits a corrosive mist that weakens structures and disorients players, with its physical integrity fluctuating with fog density. The entity is resilient to physical damage but vulnerable to rapid water flow, which can disperse its form temporarily.

The Swamp Scourge influences events by corrupting key swampy areas of the course, forcing players to adapt their strategies to avoid its decaying touch and escalating tension during fog-thickening episodes.