The Lurker Below

The Lurker Below is an unidentified being in Stygian: Reign of the Old Ones.

Description
Though never seen, this being is first encountered when the player character approaches the Key Numbered 0 in Main Street. During a triggered cutscene in which tremors begin shaking the street, the three homeless men huddled over the fire bins just North of the character will remark on the sudden tremors, one of which says “That was a close one!”

It is suggested that the Lurker below will one day soon split the ground open with its movements. The tremors, like minor earthquakes, occur periodically throughout the game after this initial encounter. They will shake the camera and can occur anywhere throughout Arkham.