Merlin and the Dragons (1991)

A young King Arthur is awoken from his sleep by bad dreams about a boy who is made king because he pulls a sword from a stone He goes to Merlin to seek his counsel and Merlin begins a story of his own about a young boy with strange abilities and visions The boy called Emrys is feared in his village called of as a demon Eventually King Vortigern comes and forces his village to build a tower for him However the tower crumbles His wizards advise him to find a demon boy and spill his blood upon the ground However when the boy is brought before Vortigern he predicts that there is a pool of water beneath the foundations of the castle that weaken it The workers find a pool of water and two strange stones from which two beasts emerge a white and a red dragon