Speak to Ur'kyo in Orgrimmar.
Hey, <race>. A messenger came through here not too long ago looking for you. Said you were to return to Orgrimmar to speak to Ur'kyo in the Valley of Spirits. He didn't sound angry, but it did sound important. Might want to check it out.
You will also receive:
- 270 experience
- 1 50 (if completed at level 100)