Duel between Uther and Tristan de Bois

The duel between Uther and Tristan de Bois took place when Tristan De Bois arrived in Camelot after Nimueh had reanimated Tristan as a wraith. He crashed through the window with his horse, threw his gauntlet down hoping it would be picked up by Uther. But it was sir Owain who picked it up, and soon after him sir Pellinore - both of them lost although they had fatally wounded the Black Knight. But the third time it was Arthur who threw down his gauntlet and Tristan accepted his challenge: a single combat to the death like the previous ones had been. Soon after that Merlin got a sword from Guinevere and goes to the Great Dragon who blesses the sword with his fire.

But in the end it is Uther who fights Tristan. At his request, Gaius drugs Arthur so he would not be able to fight. He takes the sword, Excalibur, which was meant to be used by his son, and goes to face Tristan in the arena. He tells Tristan that he can have what he came for: the father, not the son. After fighting closely for a long time, the battle reaches a turning point when Uther knocks off Tristan's helmet which reveales that he is a wraith. This act makes Tristan furious, and he angrily attacks Uther, pushin him to the ground. But his sword gets stuck in Uther's shield, and while he tries to free his weapon, Uther runs him trough with his sword, killing his enemy for the final time. Tristan screams in rage and bursts into flames.