This is also called Gwyllon. This is a Welsh word having different meanings like ghosts, spirits, human or supernatural night-wanderers up to no good or outlaws of the wild. They terrorize mankind by following them in tours, mountaineering, and other such excavations. They make the traveler lose his path. It is said that in primitive times, people used to invite them for a treat of good food in their residence, with the motto to make them happy and content.