Unfortunately, all of that could only happen in one place.
And that was the Region!
Yes, all these effects could only occur in the red light-covered Region created by the Fiery Eyes.
Although the Fiery Eyes Region was large enough, the red light would disappear when it reached its limit. But in the beginning, the coquettish red light could not be concealed.
Therefore, to use this Fiery Eyes Region, one really had to be in a place with no one else. One could only use it when having to kill the enemy. If it was used unnecessarily, one would be exposed.
Therefore, although there were other magical uses of this Fiery Eyes Region, in addition to the previous two points, there did not seem to be much use for it, yet it felt too wasteful to discard it.