Mira fought her way through hoards of Nightbringer Ants, all Peak-Stage Rank 6. Fortunately, and unfortunately, at the same time, the tunnel is extremely narrow, only allowing the ants to file in one by one.
It's fortunate because Mira doesn't have to fend off waves of ants all trying to consume her, but unfortunate because avoiding their mandibles became more difficult over time.
After she killed several Nightbringer ants in the same manner, they began learning and adjusting to her habits, something Mira was quite shocked about.
Although they've shown signs of intelligence, most beasts she's encountered were still beasts at the end of the day. However, these ants showed intelligence beyond their race.
'Have they mutated? Great…'
Mira also had a feeling that their carapace seemed a bit too hard. Her full-powered punches fueled by her Martial Intent, combined with her ice gauntlets, should be enough to kill an average Peak-Stage Rank 6 beast.