I accidentally missed a quest yesterday, so let's go back to Map 2 to complete it. Teleport to the "Thief Camp" and head towards the bridge.
Earlier, we accepted the "Baishan Secret" quest from a woman in purple on the bridge. When we arrive here, we'll find that one of them is already dead. Defeat the nearby enemies to obtain the new offensive accessory "Dugu Jueyin." (There seem to be thieves on the path leading to Xiao Zhang's place; defeating them yields story items. I missed this part, but it doesn't affect the collection progress.)
