Nalan Ziyun's stratagem was not complex.
She had stuffed the torches with the powder of the "Thousand-Day Intoxicated Orchid" early on, ready to welcome the men from the three forces.
The substance was colorless and odorless, and it didn't cause any significant harm in a short period. Therefore, Lan Feng and the others neither expected nor noticed it.
By the time Lan Feng noticed something was wrong with the torches, a significant amount of the Thousand-Day Intoxicated Orchid had already accumulated in everyone's bodies.
After this group had been inhaling the toxic fumes of the "Thousand-Day Intoxicated Orchid" for the better part of the day, she used the "Crane Nether Poison Smoke" to activate it. The resulting toxicity was nearly impossible to block!
At the very least, it couldn't be controlled simply by holding one's breath.
