Gregory thought that he had already overestimated Fein's strength, but to think that he could even severely injure an SS-rank! He doesn't really have an idea just how powerful an SS-rank is because he didn't even know if they exist. But he trusts Fein's words.
"There's an SS-rank? I thought S-rank is already the ceiling." Gregory scratched his chin.
"Although there's no known SS-rank in the public, it doesn't mean that they don't exist. Some might be in seclusion and don't want to interfere with worldly affairs. And there even might be an SSS-rank. With the population of billions, it's not that impossible. Or they might even exist outside the continent." Fein sighed.
"Hmmm... that is quite valid. Outside the continent? The strongest kingdom had already tried to explore it, but there's a barrier that prevented them."
Honestly, he believes that if SS-rank exists, they should show themselves. With that, the demons might stop their attack.