Just two lines of notification.
No warning of danger, no explanation, much less the familiar red text indicating a Boss appearance. But precisely because of that silence, the chilling sensation became all the more clear. The general chat channel paused for a few seconds, as if everyone had just been gripped by the throat. Then, it completely erupted.
[Room 117 – Oran: What does an unfamiliar gaze mean?!]
[Room 804 – Sana: Did it really see us?]
[Room 221 – Kuro: There's no attack notification. Maybe it only noticed the soul fluctuation.]
[Room 330 – Owl: Or perhaps it doesn't want to come yet.]
[Room 606 – Garland: Don't you all find this strange? The System didn't say it was a disaster, nor did it say it was an event monster.]
[Room 905 – Hellen: You mean... a hidden Boss?]
[Room 606 – Garland: I didn't say that. But if it really is a hidden Boss...]
The message stopped there, but everyone understood the rest.
