Levi refused even to acknowledge the idea of letting Azhukar leave scot-free after everything that he had done to his brother and friends. His emotions might be sealed in the Void Form, making it near impossible for them to cloud his judgment; however, this didn't mean he was going to give up just because a situation got difficult.
Thus, he didn't have two choices… he had only one.
'How am I going to finish this? Think, think, think…'
As this question took root in Levi's mind, he thought of new ideas, but nothing seemed enough to stick… Azhukar was simply too difficult to kill. He had thought of using the Cannon, but such an option wasn't viable considering that Artifacts were name-bound.
This meant Azhukar had it registered in his name, like Levi did with the Sensebound Pearl… as long as it was registered under the emperor's name, Levi could not use it since it wouldn't accept his solar energy. Without solar energy, it became nothing but a decorative piece.
