Basilisk

The basilisk is a legendary reptile reputed to be the king of serpents, so deadly that its mere gaze could kill a man and its breath could wither landscapes and shatter stone. The name derives from the Greek basiliskos, meaning little king, and the creature was often depicted with a crown-shaped crest on its head. In the earliest accounts by Pliny the Elder, the basilisk was a small snake, no more than twelve fingers in length, but so venomous that it left a burning trail of destruction wherever it slithered. Medieval bestiaries expanded its powers considerably, attributing to it the ability to kill with a single look, scorch the earth with its presence, and poison water sources simply by breathing near them. The only creatures immune to the basilisk were weasels, who could kill it with their scent, and the rooster, whose crow would cause the basilisk to die in agony. In European legend, the basilisk was said to be born from a serpent's egg incubated by a rooster, a fitting origin for a creature that combined features of both.