The Mosh'Ogg Bounty

There's been some activity up north, at the rebel camp. I just heard from a soldier named Nimetz that a ‹race› ‹class› up there found the key to what's been driving them so crazy. That wasn't you, was it? Anyhow, he sent a sample to me, and it looks just like the rocks I've been seeing over at the Mosh'Ogg Ogre Mound, to the northeast. I've heard that the ogres are guarding a chest up in some ruins behind their mound. I suspect it may be related. Care to fetch it for me?