Go all the way to the other side of the riverbed; there's another chest there.
Open it to obtain dust motes and enhancement materials.
After obtaining this material, return to the main bridge. There are two shield-bearing soldiers on the bridge. Use an axe to break their guard, and once their guard is broken, you can defeat them easily.
After crossing the bridge, you can pick up materials along the way.
Walk forward and unlock the door.
After coming over here, there is a dust mote in the cage on the right.
We can hear the sound of a treasure chest above this dust mote. Look up to see it, but we can't reach it for now.
There is a material to the right of the cage, just go straight.
Turn around and head forward to reach the Steel Giant Tower. There is a save point ahead; save your game and then talk to the person nearby.
After finishing the conversation with him, you will receive the quest "Deep in the Valley." The door on the right cannot be opened, so head up the slope.
