Well im sure some of the earth mages can fix the garden.


Also, Arata sounds op. Being basically immune to all magic but destruction and always able to be stronger than anyone he want to fight.

Meaning all opponents will be at a disadvantage and all those that do not have destruction based magic is useless.

That with the ability to bend reality to his advantage against foes that could have a chance against him. 

Sound like a mixtue of God-mode and Deus-ex.