Ackster wanted to reproach himself for not considering the possibility earlier. If he had, he might not have needed to risk his party members' lives by trying to refine world power in the middle of the battle.
But blaming himself for a mistake was foolish to do in the current situation. If he wanted to eradicate the Voice, he needed to focus every ounce and fiber of his being on the battle. He couldn't let a stray thought distract him.
Instead of regretting the past, he should embrace the future.
Ackster focused all of his Overhuman Senses on The Hero, who was in the middle of gathering world power for a strengthened attack that had Ackster's spine trembling like a leaf caught in a storm.
While doing so, Ackster split a part of his mind and broke off a strand of Limit Breaker's energy. He followed the lines and scars in his soul until he found what he was looking for. He found the part of his soul that housed the Demon Sword.
