Demons are not suited for combat and prefer to hide in the shadows, using schemes and plots to achieve their goals. This is the definition given by the Angel Alliance to their number one nemesis, but that was the definition from a hundred years ago.
Elorie clearly mentioned that the newly emerged demons are no longer as weak as before. Not only have they masked that distinctive stench, but their power has also grown immensely. Although she was indeed heavily injured at the time, she wouldn't have lost a physical battle to demons from a century ago. This indicates that they, too, have benefited from the progress of the times, whether that benefit came from technological advancements or the utilization of miraculous objects, the fact remains that demons have become much stronger than before.
Therefore, Chen Xuan also needed to rally his strongest forces.
