Since the noble couldn't use his domain or other divine abilities on Legion, he got creative by using his divine abilities in ways that Legion couldn't block.
Not only did the legendary noble enhance his physical power and speed, but he also enhanced his defense with his domain. He had literally made himself immune to every kind of attack and injury with his domain.
Thanks to his domain divine ability, he had gained the defense of an undying, the speed of a traveler, and the strength of a giant. All it cost was a lot of spiritual energy.
He also spent spiritual energy to turn the ground muddy to make Legion slip and made the air solidify into a wall to slow down Legion. This was done to obstruct Legion from reaching him and impaling him with that white horn.
He was enhancing himself with the power of his domain and also using the world as a weapon against Legion. It felt as if he lacked weaknesses and could create a solution to every problem.