Most demons possessed the same weakness. In their arrogance, they considered themselves the strongest in the world and instinctively looked down on humans.
True, they’d been sealed away in the ancient war, but that hadn’t been because the humans had bested them. The humans had made use of all possible resources at their hands and plotted and schemed to make everything work.
In straight combat, humans were no match for them.
The current trend in modern times reinforced this belief. The demons had advanced unopposed from the other side of the continent, conquering all of the territories and defeating all factions that stood in their way, until...