Valerius asked you for help because there were problems with the Artefact in the Outpost Ruins. Lakaias said that the Artefact had been destroyed and the top part of the Artefact had disappeared. He tasked you to combat Caryatids and search for clues. You eliminated the Caryatids and you actually found evidence. These indicate that the Lepharist Revolutionaries destroyed the Artefact.