Into the Churning Gulch

Very well, I'll create this trap, but first I want something in return. There happens to be a nearby gronn that is in possession of an item that I want, but you can't face him, not yet anyway. So, you and I are going to fashion a sleeping powder from the poison of the nearby crust bursters. You'll find them in the Churning Gulch to the southwest. Bring me a number of their glands, and be quick about it!