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Frank saw with a smile what he had done, this was his doing, a powerful new being, a paladin, had been born. A knight of his own that served him as if he were a divine being, a god! And well, he was.
His divinities manifested in his mind as Matsuo saw these visions, and felt completely enlightened by the prospects, he had grown stronger thanks to Frank's amazing help, the divine protection was way more than he could had ever hoped to get, and way more than he could ever bargain for at this moment.
He certainly had not the power to become a demigod at least, but he could be considered to be someone given the task of slaying evil gods by the god he prays to, that feat alone can be done by hero-type mortals capable of even slaying godly beings!
Check "The Protagnist's Sister Is Actually the Strongest"!