With the help of a few pints of beer and the young Gwyned, descendant of Galahad, to whom he entrusts the fabulous sword Excalibur, Merlin seeks to break Christendom out of Ireland and to save a world of magic and enchantment gradually destroyed by the new beliefs. Gwynned and Merlin have finally set foot on the land of the islands of Brittany. They must reach Stonehenge where the old millennial Druid intends to realize the ritual that will give back to the magic all his strength of old...End of cycle.