Blocking the navigation route is a serious illegal action.
Navigation routes are very important. When Li Ang first arrived in Nebis, he didn't understand why the sky, which should be unobstructed, had designated routes. What was the standard for aerial realm divisions?
It wasn't until he took his first flying airship across realms that he understood that because this world is filled with magic, many situations defy common sense.
There exist strong vertical chaotic air currents between the aerial realms, powerful enough to blow over all flying airships and sweep them and their passengers to the Bloody Red Land.
These air currents are called "Aerial Wind Walls." Visually, they appear as substantial, translucent high walls connecting the blue celestial dome and the blood-red Earth.
