The Aether Generator in the Krug Basin test area was no longer working. Eddas, the Reian Tribe elder, explained that the energy of the region had changed since Taloc's Guardian had come to Gelkmaros. He recommended that you investigate Taloc's Hollow. You went to Taloc's Hollow and used Taloc's fruit to gain strength. In Taloc's Hollow, you defeated Celestius, who had sabotaged the Aether Flow. This allowed the Aether Generator to be reactivated. After completing the task, you reported back to Angrad. He realised that the power of Taloc's fruit had made you stronger.