Someone used a hypnotic item, potion, or skill.
Wen Nan realized this not long after he returned to the private room.
Similar situations had occurred in previous instances, so Wen Nan was not entirely unprepared.
He had heightened his vigilance and, upon recognizing that something was amiss, he used several antidotes and anti-poison items from his reserve equipment accordingly.
That was why Wen Nan was practically the last person standing in the entire room.
However, he still underestimated the strength of the hypnotic effect this time.
If he were facing the level of hypnotic effect that the troubled girl Sun Yi once drugged his drink with, the anti-poison items he had prepared in advance would have been enough.
But this time, the person behind it had very high capabilities.
So high, that even though Wen Nan was prepared, he was still powerless to resist.