A black square? Danger!
Chapter 223
What Oliver did was simply perform a brute exorcism without any basic technique, just dragging out the dark espera from the man and purifying it. It was a straightforward, raw process—effective but lacking the finesse of more refined techniques.
He was able to do so only because the man had not been completely corrupted by the dark espera. A full transformation into a heretic hadn't taken place yet.
In fact, while there were many heretics here and there, a majority of them weren't as corrupted or brainwashed by demons as some of the extreme ones.
Jetia and his comrades were examples of heretics who had completely submitted to demons and could not be saved anymore.
This man, however, was different. The dark espera hadn't taken over the man's mind and soul yet. It was possible that the woman, the dark alchemist, had tainted and brainwashed this man, turning him into a heretic.