Basilisk

In European bestiaries and legends, a basilisk is a legendary reptile reputed to be a serpent king, who causes any being to die when glanced at. According to the Naturalis Historia of Pliny the Elder, the basilisk of Cyrene is a small snake, "being not more than twelve inches in length", that is so venomous, it leaves a wide trail of deadly venom in its path, its gaze likewise just as lethal.