Once the Underworld Demon Cave beneath Floating Cloud City had been drained of its corrupting energy from the Shadow Demon Curse, it quickly became quiet.
Now, it had become a wind tunnel testing ground for Wei Cheng and Qi Mei.>
In this vast underground space, all one needed to do was to seal up all the holes around and randomly explode dozens of Wind Blade Seals, and a near vacuum-like environment could generally be attained.
Even Spirit Swallow practitioners with poor wind sensing abilities could easily perceive the changes in the tiniest currents of air, as well as the variations in this place's various parameters effortlessly.
Let alone existences at the level of Wei Cheng and Qi Mei.
Qi Mei's wind sensing was extremely delicate, gentle, and refined. She could quickly find the faintest changes in a wildly complex wind environment of hundreds or thousands of gusts, and predict their paths.
Therefore, she was the best person to be in charge of controlling the wind tunnel.
