The shadows that didn't pass through the ground or begin floating in the air continued slowly spreading like a curse, covering the ground they crawled over in inky darkness.
Toz was incredibly excited over the discoveries regarding the darkness and void combination. The thing with passing through solid matter was one thing. But Toz was pretty sure that the aspect where the darkness spread like ink could be a clue to improving his spell.
As Toz continued trying things out, he learned how to control the various aspects of the elemental combination.
He wanted to dive into creating his spell as soon as possible, but he also wanted to create his sword as quickly as possible. And a large part of the sword creation would be waiting for the trees to complete the sword. Toz would have enough time to create his spell during that part.
After reaching a decision, Toz continued on with the next elemental combination. Void and fire.