Gravis narrated everything that happened to him after arriving in this lower world. He also told them about his abilities and strength when he had just arrived. All of this was in the past, and everyone important already knew everything important about him, after all.
When he told them that he managed to slay a low-grade Demonic Beast while not having tempered skin, they nodded in praise. "That's at about the level that a genius from the Core-Continent would have," Old Man Lightning said.
Gravis nodded. "I thought so too. I might have had the advantage of a Will-Aura, but I hadn't supplemented my fighting style with Martial Arts. On top of that, they probably know more about their targets than me," Gravis agreed.