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Frank seemed to have interesting intentions! He had purposedly let Matsuo enter because he wanted to test something which could also help his friend… Give him a divine protection!
He remembered giving one to all his family and even tamed monsters and more before, although now that they had become godly beings themselves, such divine protection hasn't been suppressed, but it simply had grown to be a small bonus compared to what they encompass now.
However, if Matsuo as a mortal received such a powerful divine protection, he was sure to get a good boost. Especially because divine protections enhanced the power of a wielder the more power and divinity the god had, and Frank was a cheat god, he had the power of several divinities together! This meant that he could give him way more power than any being on his level could give through a divine protection.
Check "The Protagnist's Sister Is Actually the Strongest"!