From the end of Evershift Labyrinth, follow the gold marker along the stone corridor lined with shelves. Enter the lit doorway at the far end to find Jin Zhongyuan and trigger the scene before the Lodestar Swordmaster fight.

Fight Lodestar Swordmaster in the arena beyond the labyrinth. The fight changes from the normal chamber to a fire-filled phase with flaming sword pillars. Keep the boss and the clear spaces between those pillars in view as you reposition. After the victory scene, Hidden in Plain Sight begins with Check on Swallow.