At Thandol Span, they found Hjalmar held captive by Dark Iron dwarves under the command of Balgaras the Foul. Balgaras intended to kill Hjalmar by melting the Helm of the Anvilmars onto his face. However, Thargas cut his hand off before he could cast a fire spell, and Hjalmar was thus set free. With his other hand Balgaras tried to light one of the explosives, Hjalmar jumped to prevent it, and was mortally injured by the explosion. Before he died, he gave the Helm of the Anvilmars to Thargas telling him to save Thandol Span. In Hjalmar's name, Thargas killed many Dark Irons and helped save the span.
Afterwards, Thargas joined Varian's group and aided him in driving off Onyxia from Stormwind and assaulting Onyxia's Lair. After Onyxia was slain, Thargas departed with the Stormwind soldiers who were returning to the Eastern Kingdoms so that he could sort out the affairs involving his brother's death and his own estates. Varian thanked Thargas for his aid and friendship and told him that Anvilmar could always count on Stormwind as an ally.