Sir Mordred

Sir Mordred can be found on the top floor of Keep Le Faye near Catherby. He is fought during the Merlin's Crystal quest. He can be fought, but when at 0 LP, Morgan Le Faye will appear and ask that you spare him. If you ignore Morgan Le Faye and continue to attack him, he will regenerate all of his life points and you must fight him again while Morgan Le Faye wanders around aimlessly. Players can train indefinitely on him this way, but it is not recommended because he has very high accuracy, strength and defence for his level. Mordred is the son of Morgan Le Faye. During the King's Ransom quest, he will actually die if you attack him, but will respawn soon afterwards.

Sir Mordred is also the leader of the Renegade Knights.

Before he was updated in the King's Ransom quest, he could be found wearing black armour whilst wielding a sword similar to Darklight.

For whatever reason, he is much weaker than the rest of the Knights of the Round Table, despite being an ex-member of their order.

Trivia

 * He looks like to be wearing a mix of Tyras Helm and Spiny Helmet in his chathead.