Deciding that the goblin can go to hell, you find the boat and sink it off the coast of Westfall. Unfortunately for Sentinel Hill, your prognosis for Helix affects it as well. You arrive back at the Hill to find its Sentinel capacity torched, the erstwhile Marshal unhappily surveying.the ruins. "Years of work burned to the ground in minutes," he says. "Damn the Defias! And this is only the beginning, Torquewrench!" At last, your surname. "We have a long, hard road ahead of us."
He seems to have forgotten that you have a tank. Drive down that road into the sunset.