The Big Bone Worm

I was right! These carcasses you brought me belong to maturing worms. Do you know what that means? It means that somewhere out there is a big one! I think we can get it to come out if we can provide the right kind of food. Let's see... something big! Yes! I remember seeing clefthooves east of here on the other side of the Bone Wastes. Get out there and kill a clefthoof. Once it's dead, use the drums. Hopefully the big one will come up to feed. If you manage to kill it, bring me its organs!