If we keep moving forward, we'll return to the vicinity of the mourning hall. Behind the rocks ahead lies the final map, "Broken Soul Mountain." However, we don't have to enter just yet; we can finish other quests first before heading in (though entering now is also fine, as we can activate a teleport point inside).
Let's first return to the nearby teleport point, or use a Teleport Talisman to directly teleport to "Xiao Zhang's Hideout in Dreamlike Villa."
Approach Xiao Zhang and speak with him. Return the lost treasures of Dreamlike Villa to him, and we'll receive the offensive accessory "Moon Thunder Lantern." This will also complete all our "Sleight of Hand" quests.
