Basilisk

In European bestiaries and legends, a basilisk is a legendary reptile reputed to be a serpent king, who causes death to those who look into its eyes. 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, and its gaze is likewise lethal.