The Berserker Sword Technique
Arthur stayed behind for a couple of days before everyone understood their roles very well and started to work efficiently without the need of his intervention.
"What's the total power of this array?" Amelia asked the question which many wanted to know the answer to.
"Frankly I dunno," yet he shrugged before adding, "this is done to prepare for the upcoming competition. We need to crush everyone and be sure we won't fail."
"But the masters might learn our array and go to tell their kids about it," Randy said in discontent and doubt.
"That's a good point," Arthur nodded before adding, "so we'll just stop making this array, and any other thing I edited when they are here."
"You plan to surprise them?" Ron laughed as he loved the idea.
"We need to," Arthur smiled helplessly, "and if we don't need to use any of this during the competition then we won't."