Eddy Enigma originated from a cosmic fragment that crashed into the creek millennia ago, lying dormant until upstream construction disturbed its resting place. The disruption awakened the entity, which now uses water eddies as conduits to study human behavior through the fog.

Eddy Enigma exists as a non-corporeal form that phases between dimensions through water vortices. It can manipulate fog density and create minor temporal distortions near eddies, causing disorientation and delayed perceptions. The entity is immune to physical harm but vulnerable to intense light, which temporarily disperses its influence.

Eddy Enigma influences events by using eddies to monitor and subtly alter the creek's supernatural activity, serving as an unseen orchestrator that tests players' adaptability to changing fog and creature behaviors.