Proof of Demise: The Black Knight

Objectives
Archmage Lan'dalock in Dalaran wants you to return with a Fragment of the Black Knight's Soul.

This quest may only be completed on Heroic difficulty.
 * Fragment of the Black Knight's Soul

Description
My counterpart, Archmage Timear, has asked me to warn you of something dire. Soon, you will be participating in the Trial of the Champions at the Argent Coliseum in Icecrown. You must beware of interference from one known only as the Black Knight.

Bring me a fragment of his soul that the Kirin Tor will know he is dealt with. I am told that failing to do so will be your own undoing.

Progression
Did the Black Knight appear unexpectedly as Timear foresaw?

Completion
It is good to see that you have emerged victorious from the trial. Truly, you are a champion, not only of the Argent Crusade, but indeed of the Kirin Tor as well.

One can only hope that you have dealt the final blow to that dark villain and that's the last that we will see of him.