The sathaq worms' presence induces pain in creatures native to the Material Plane. Any creature that starts its turn within 30 feet of the sathaq worm must make a DC 17 Fortitude saving throw. On a failed save, the creature is poisoned until the start of its next turn. If a creature's saving throw succeeds, it is immune to the sathaq worm's Agonizing Aura for the next 24 hours.