In mythical times of a mysterious civilization, because poorly known: Celtic born of the intimate link between gods and men, a fabulous kingdom: Cathair-Fleodruinn (City-Floating). However, a prophecy plans as a threat to the perpetuation of it. Druids, invincible warriors, a beautiful princess, elves, dragons, dark and light forces will participate in the vortex of some eventswhose cause lies in the heart of men, and whose consequences are transcendent not only for the heroes of legend, but also for the existence of the kingdom. The legend of the light-Fleodruinn Cathair is a story conceived the old fashioned way, in it, the author aims to unite 'the useful' to 'the nice'. Or, said in another way, putting the fantasy at the service of moral and ethical teachings.