Immortal Era's Crafting Master
That person was naturally Shiroa, who had witnessed Kirou taking down a level 23 monster practically solo.
Just as she wanted to say something, however, she noticed a gaze from Kirou, which promptly sealed her mouth shut. While Kirou still had a simple smile on his face, his eyes told Shiroa very clearly that she would suffer immensely if she uttered a single word. Cowed into silence with just a glance, Shiroa now understood what that unnatural feeling she that she felt earlier was. It was fear. It was the kind of fear that seeped deep into her being, making her feel a chill up her spine, even though she's playing the game.