Part 4

Enter the area and note the skeleton key door and floor socket. Climb the stairs.

At the end of the northern balcony, use Soul Splitter. Have clone 1 activate the hanging switch to open the southern balcony door.

Enter the southern door, drop down the hole, follow the path, and climb the wall.

In the room at the top, pull the ball next to the pressure plate, facing the southern locked passage.

Stand on the pressure plate to lower the gate, then punch the ball down the hole.

Exit Soul Splitter and proceed through the now open door. Look behind the stairs for a chest.

Make your way south. When you reach a gap, wall run up the stone block to your left. Use Deathgrip at the end to reach the top of the central structure.

Enter Soul Splitter. With clone 1, Deathgrip to the hanging switch to the west, which rotates a wall section and reveals a new Deathgrip hook.

With clone 2, jump to the same switch. Wall run right, then use blocks and Deathgrip rings to reach a platform. Step on the pressure plate to release a blue ball.

Exit and re-enter Soul Splitter. Have one clone wall run to the left handhold.

Have the second clone wall run to the right handhold.

Switch back to the first clone. Use Deathgrip rings and wall blocks to continue left to the end platform.

Rotate the lever to move the bridge 90 degrees. Leave one clone on the switch.

Use the second clone to push the ball across the bridge into the socket. Grab the skeleton key from the chest in the newly opened room.

Exit Soul Splitter. Look off the central platform for a pipe; drop down for a chest, then return to the previous room.

Open the skeleton key door and follow the passage to the circular room. A gate will drop, initiating a fight with forge guardians.

Defeat all forge guardians. Loot the chest.