After the fight, talk to the Iron Ghost on the left to receive the quest "Fist Core".
Let's go to the right and slide down using the rope.
After coming down, go right and pick up the purple item.
Shoot the bag down before going down.
Slide down to grab this, and the exploration here is complete.
Let's head to the nearby save point and teleport to "Tomb of Remains".
The grave to the left of the save point is the one the Iron Ghost asked us to pay respects to earlier.
Interact here to obtain the Shadow Armament Soul-Forging Material: "Fist Core Fragment · Shell".
Shadow Armament Soul-Forging Material: "World-Ending Fist Core". This also completes the quest "Fist Core".
