There are two species of the creature. The first burn everything they approach, the second can kill every living thing with a mere glance. Both species are so dreadful that their breath wilts vegetation and shatters stones. It was even believed that if a man on horseback should try to kill it with a spear, the power of the poison conducted through the weapon would not only kill the rider, but the horse as well. The only way to kill a basilisk is by holding a mirror in front of its eye.