From the Horde's alliance with the dragon Deathwing during the Second War, we know that two of his lieutenants, Blacklash and Hematus, were imprisoned within Lethlor Ravine far to the east. We must silence our depraved allies of old to restore honor to the Horde!
We hired Tho'grun and his band of ogre mercenaries to help us obtain the Sign of the Earth, a key needed to unlock the drakes' prison. Tho'grun betrayed us though, overwhelming us and taking it for himself. Go to Camp Boff and take it back!
If you've not dispatched him yet, then waste no time going to Camp Boff. It is to the southeast of Kargath.
With Tho'grun dead, his corpse picked clean by the desert winds and scavenging buzzards, the ogres will be put into disarray. Though a small victory, this will lead to a much larger one
The Sign of the Earth is now in our possession, and we can open the black drakes' prison in Lethlor. We shall free them from endless imprisonment, albeit to their doom!