You must be friendly to accept this quest.
You will need:
Obsidian Warbeads drop from any of the ogres throughout Nagrand.
All this waiting around for Oshu'gun to be ready for digging is eating into our profits, <name>.
Fortunately, I've devised an alternate source of income. The ogres of Nagrand wear warbeads made of obsidian, a mineral that commands a hefty price in many other worlds.
Zerid already has had to take care a few of the brutes as a matter of security. Think of the warbeads as an added bonus. Or better yet, don't think about it too much and just bring them to me.
How are those ogres treating you, <name>? Tough bunch, aren't they?
Excellent. This will keep us in business while we wait for the Sha'tar to finish whatever housekeeping it is they need to do inside Oshu'gun.