Into the Churning Gulch

So, your Rexxar would have me fashion a poison for him? I'll give him what he desires, but there will be a price. Even for friends, there must be a price. Free things destroy friendships. First, you must venture a short distance to the southwest to the Churning Gulch. Therein mill some of the most poisonous creatures in all of Outland, or anywhere. I speak of the crust bursters, and this poison will require gathering their glands for me.