Gulkalla's mission is to reconstruct Impetusium, but most of his labourers fled after spirits of the Ancient Heroes attacked them. You disrupted the spirits for Gulkalla, who figured out why the spirits rose from the dead and how to send them back to the Aether. As Gulkalla requested, you obtained the items used to summon the ghost of the ancient Mau chieftain Umkata. You destroyed Umkata's spirit so the Ancient Heroes could rest in peace.