This was by far the place with the highest spirit power in the entire array, and he wanted to absorb as much spirit power as he could once be released.
Then he closed his eyes, and placed two palms over the box, before muttering something. It was the incantation of a training technique, as he decided to go directly into training, allowing him to accelerate his absorption speed.
He took care of everything, and yet missed one simple and game-changing fact; this box didn't contain spirit power from this world, or from the other middle world.
The box came from the outer world, and William thought it was kept in the other world for long years, absorbing spirit power from there. But he was wrong. The boxes came originally while being filled with spirit power to the brim in the first place!
So the moment he started training, his blood written over the boxes started to shine. The next moment the box started to slowly glow, and spirit power began to gush out.