Born from the collective spiritual disturbance when upstream construction disrupted the creek's ancient flow patterns, the Seepage Ghost represents the accumulated essence of ecological death seeping through disturbed soil and rock. As contaminated groundwater carries this supernatural residue toward the surface, it gradually manifests wherever natural seepage occurs, serving as a living conduit between the underground disruption and the surface world's supernatural transformation.

This ethereal entity appears as a translucent figure composed of condensed mist and water vapor, anchored to natural seepage points where groundwater emerges from soil and rock. It possesses the ability to phase through solid barriers while remaining bound to water sources, growing more substantial as humidity increases and fog density rises. The ghost serves as a supernatural catalyst, accelerating the transformation of natural water into otherworldly fog and creating dimensional weak points where creatures can more easily emerge from the depths.

The Seepage Ghost functions as both an early warning system and an environmental amplifier, appearing when supernatural saturation of the creek system reaches critical thresholds and actively facilitating the escalation of creature emergence events. It transforms the gradual infiltration of groundwater into supernatural phenomena, making the entire course increasingly hospitable to aquatic horrors as the season progresses.