In mythology, the gorgon is a terrible beast that transforms people into stone or kills them with its terrible gaze. In Greek myth, the original gorgons were three sisters with serpents for hair whose gaze would petrify anyone who looked on them. Of the three, the most famous was Medusa, the only mortal gorgon. A different version of the gorgon is a bull-like creature with a deadly breath or gaze, also known as the catoplebas. The gorgon in Dungeons & Dragons is based on the later sort.