However, as Sir Orwain battles the knight, the Black Knight is quickly victorious. He once again drops his gauntlet and once again, someone besides Arthur picks it up. Knight after knight fall to the feet of this mysterious warrior. Each one angering Arthur further. With Uther preventing the best fighter from battling, his son. After one knight is killed again, Arthur is done obeying his king. He throws his own gauntlet at the feet of the Knight, declaring his challenge.
Gaius notices something about this Knight. He carries the crest that Gaius recognizes as Uther's brother-in-law, Tristan. However, Tristan had been long dead, killed by Uther. And when the dead are brought to life, they cannot be killed again by mortal means. Dunh, Dunh, DUNH!
As Uther is left to muddle over this problem, Nimueh appears in front of him. She shows Uther what his hatred has caused. Nimueh declares the truth of Uther's hatred. Uther and his wife Ygraine could not produce an heir, therefore Nimueh, who was his friend, agreed to give Ygraine a child, Arthur. But the balance of life requires one life unnaturally ended in exchange for another unnaturally given, so Ygraine died. Uther blames magic for this misunderstanding and exiled Nimueh while purging the land of all things magic, including people. These people were Minueh's beloved friends, whom she loved aand her own friend killed them. For this betrayal, Nimueh has remained furious over years. She ends their encounter by declaring that she brought Arthur into this life and that she will now take him out, so Uther can understand the pain of watching a loved one die at the hands of a once-friend.
Yet she did not account for Merlin's ideas. He decides to construct a sword that could penetrate anything and strike a killing blow to things mortal and immortal. First, he goes to Gwen, and finds the strongest sword that her father has ever made, then he goes to the Great Dragon. He has read that a sword bathed in a Dragon's fire is invincible, a weapon which the Dragon is reluctant to create. However Merlin assures the Great One that only Arthur shall wield the sword, and the Dragon encases the weaponry in his fire.
Once the day of the duel arrives, Arthur is confined to his room, with Uther taking his place in the battle and wielding the sword. (Uh, Merlin? Isn't this the exact person the Dragon wanted away from the sword?) But before Uther can be stopped, the duel commences. Blows are exchanged, fingers are bitten, pants are wetted until the Knight's helmet is knocked off. Tristan has become a wraith, something wrinkled, shriveled and inhuman. Yet still, it comes at Uther with a liveliness unmatched. But Uther holds his life in especially high value and lands a killing blow. Where the sword has cut seems to glow and burn the wraith from the inside out. Nimueh, who was in the audience, gasps and quickly escapes, once again foiled.
As the king reflects upon the events, he wishes to keep the sword. But Merlin, who got a fierce scolding from the dragon, steals it and puts the sword where no mortal man shall find it.
All images from: http://www.merlintvshow.com/photos/album/87764/109+Excalibur?offset=20&maxResults=20