Fear

Ether annihilation!"

For a while now this has been Arthur's go-to finishing move, given the fact that its power and range also grew as he grew in strength, Arthur felt he could at least destroy the whole royal capital if not more if he used that move together with unlimited superposition

Not only that but if he added some of the world source from the demon world to the mix, Arthur felt that even the whole empire wasn't safe

Sometimes, Arthur even felt that this was the way those world powers who had access to nuclear bombs in his past life felt.

Able to destroy the world at the moment, but also unable to do it for fear of mutual destruction.

*However, unlike a nuclear bomb which can be created by anyone as long as you understand its principles and have enough resources. *