Rumindrol

The elusive rumindrol, an apex predator of the Darklands, lives deep below the surface of Golarion. Capable of emitting siren-like calls that reverberate far and wide through the tunnel systems surrounding its lair, a rumindrol feasts on the giant subterranean worms drawn to its call—as well as shulns and other creatures that feed in the worms' wake—by building up sickening subsonic vibrations within its targets until they are unable to move.