Find a way to enter the Great Sphere.
- Time to get to the middle of the arena.
- This can be done either with a launcher or a long jump from the platforms to the center.
- Be sure to collect the loot in the middle area as well.
- Then go over to the left and to the launcher in the middle platform.
- Rotate the launcher to point upwards.
- After that, use a Scorch Cannon to power up and launch yourself up into the heights of the Great Sphere.
- Once there, go over to the red-lit side of the room and take the slope upwards.
- Inside there, just follow the path to the right.
- Just head along the path here to reach the Wilhelm's Hoard.
- To start the final encounter, approach the crystal in the center of the room.