This quest was marked obsolete by Blizzard and cannot be obtained or completed.
Speak to Thrall in Orgrimmar and tell him what you've learned.
You are one of my lieutenants! Prepare yourself, <class>. I will call upon you soon.
My time spent on the Searing Blade may be all but wasted now, but that does not mean that the Shadow Council's schemes elsewhere must suffer. I will do what I can to minimize the damage here in Ragefire Chasm. In the meantime, I will have my agents in the Barrens and Ashenvale begin work on our newest agenda. Return to me soon.