After obtaining this Black Stone Fragment, head back up and go to the other side of the bridge. There are materials on the corpse by the roadside.
There are several more wolves ahead to kill. After defeating them, pick up the Dust from the table on the left, then head right.
Head right to exit the cave. Interact with the mechanism on the right to lower Xiao Zhang.
After lowering it, jump down from the side (don't overshoot). There's a treasure chest on the next level. Open it to obtain the offensive accessory "Knight's Slash Charm".
