[You stood at the edge of Dawn City, watching it rise rapidly into the sky and soon enter the clouds more than ten thousand meters above...] [The surrounding temperature began to plummet, and the air pressure dropped rapidly. You and the Fools around you began to struggle to breathe, and many Fools with average constitutions were already beginning to lose health...] [Through your City Lord privileges, you activated the 'Magic Power Ecological Bubble'!] [A transparent, spherical membrane appeared around Dawn City, enclosing the entire Sky City like a soap bubble...] [Enhanced by the power of miracle, the Ecological Bubble not only isolated the environments inside and outside the Sky City, keeping its interior as comfortable as spring all year round, but also bestowed an invisible 'magic power shield' on every Fool within it, preventing magic power from escaping.] [Protected by the Ecological Bubble, the residents of Dawn City could continue their ascent safely...]
Before Dawn City took flight, Mu You had already used the Lamp Genie's third wish. His wish was to modify the Ecological Bubbles of the Eleven Sky Cities into special barriers that could expand their range while ensuring that magic power would not escape.
When residents left the range of the modified Ecological Bubble, it would form an invisible shield over the players' bodies.
Any magic power generated outside by players who had received the vaccine would gather within this shield. When they returned, the shield would merge with the Ecological Bubble, releasing the magic power it contained into the bubble's range.
This would allow them to recover as much of the magic power produced by the vaccine as possible without interfering with players' activities.
Once the concentration of magic power within the Ecological Bubble reached a certain level, the bubble would automatically expand outward.