Merlin's Apprentice - 1x02 - Part 2- Followmy.tv

The remaining people of Camelot have traveled the countryside for several months, seeking the Grail while fleeing their enemy. Jack is frustrated that his concentration does not give him insight, so the Lady of the Lake sends him a vision of the Grail's whereabouts. The group goes there, to discover that the water is cursed and several knights are murdered by a beast attempting to swim to the Grail's cave. Meanwhile, the Lady has told Rauskaug of their location and the barbarians begin their pursuit.