Go ahead and pick up the two items in front.
After picking it up, we jump down. There is dust on both the left and right sides of the wooden plank.
After picking it up, use the nearby chain to cross to the other side.
Enter the room and pick up the dust on the left.
There are two more on the right.
Climb up along the coffin; there's another save point above.
There's dust on the coffin, and an item on the wood to the right.
After grabbing the item on the wood to the right, we head toward the coffin on the left.
At this spot, we use the chain to cross to the other side.
Go across to grab Xiao Zhang's treasure chest. There's dust inside the coffin on the right.
This treasure is the "Stargazing Astrolabe" (there's a wall on the right that you can slide down, but we need to go back for an item).
