I stopped slashing as soon as I felt that there were already no signs on my side of the mirror anymore. So I looked behind and saw that the whole area has darkened a lot.
Yet the amount of Shadow creatures is still present, it's not that big of a change for them. They still haven't gone away and neither have they weakened any. If anything they seem to be getting stronger.
The air that I could breathe through is now tainted with a dark purple. Like it's made out of tar… but it was also not the usual dark color. If I hadn't felt the air with my hand, I would have never recognized the difference between this color and dark blue.
'Aura' I realized. This must be a dark aura. And as far as I can tell, this aura just happens to be the strongest aura that is here at the moment.
This means that if the battle goes on any longer then I am not sure what will happen.