Here is yet another dark little tidbit about water. In Celtic regions, there was a creature called a water horse. This creature was so powerful-looking and enchanting that once see, a person could not help but wish to ride on its back. If he tried, he would soon regret it. It would run so fast that a human would not be able to catch his breath, whereupon the horse would plunge back under the water, carrying the rider with it to a watery grave.
Thought to be most prevalent in the month of November, these magnificent creatures could shapeshift into human form. In this capacity they were known to eat their victims. It was said that the only way to kill a water horse was to hold it over a roaring fire until it melted.
In Scotland, this creature was known as the water bull and was a guardian of the entries into the fairy realm.