Arthur's power output is only 19.66C. While this is stronger than the vast majority of the enemy, there are still some enemies that are stronger than him.
What he does is to pass on the information about these powerful enemies to Thor. Thor then prioritizes eliminating them with the guns.
While this is going on, he used the Wood Army spell to convert a bunch of seeds into plant puppets. Then he had the army of plant puppets to flank the domain of the Lightning Net spell and assist the soldiers in his army.
He could only create a hundred wooden plant puppets. But all of them are at the four mortal coil with the same power output as himself. This made it look like the sixth division had 100 golden core fighters.
With this kind of arrangement, the soldiers of the sixth division were not overwhelmed by the enemy. They were able to stand their ground and protect the mobile fortress from suicide bombers.
