
Since Serie claims that clairvoyance spells were passed down from the south, could this connect to the Hero of the South, the one who could see the future? We know he fought and defeated several Sages of Destruction (Demon King’s generals), but we only know that the demons eventually defeated him, we don't know what really happened. Could the demons have tampered with his corpse or magic? Or perhaps a descendant was captured and brainwashed by the Shadow Warriors.
I still think this is all part of a demon scheme. The demon Schlacht could see thousands of years ahead, he knew he would die at the hands of the Hero of the South and still chose to face him, which means there was something to gain. Now, seeing how Serie’s killer seems to wield clairvoyance as well, I feel it has to be related to these 2 individuals.
And honestly, I’m convinced the demons’ ultimate goal is to resurrect the Demon King, perhaps in human form since he was said to want to coexist with humanity. If that happens, it could also explain why Himel couldn't draw the hero sword from the stone, the time to wield it simply hadn’t come yet. Which also makes me curious about the goddess's magic, and if there really was a goddess, maybe an elf that ended up being glorified as a god due to helping humanity for a long time... Anyway, I'm rambling.

I feel like the whole thing with the Shadow Warriors is somehow connected to the Demon King and that demon who could see the future. Maybe they took control of the remaining Shadow Warriors while posing as humans, which could explain why the Warriors have so many powerful/important people on their hit list.
I mean, why on earth would a human want to kill the mage from the Hero's Party who saved the world? Unless it's somehow tied to the demons wanting to eradicate anyone powerful, giving them the edge over humanity.
There's also the possibility of it all being connected to some sort of extreme anti-magic ideology, but I feel like the demon theory would make more sense, as they've been the enemy since day one.

I don't think the demons know about not care much about human politics. With the exception of Macht, they probably can only get a rather shallow read on human motives. The magis association nor the empire knows what the shadow warriors goal is, how would the demons know? Esp since the demons aren't a organized faction anymore

Why is this man biching about his engagement being broken now? Didn't he say he didn't like his fiance, that the saintess apprentice was all that and more? Shouldn't he be happy he's finally free from his heinous ex-fiance and is finally free to go after that other woman? Oh wait, he just happened to be a dumb narcissist, no shit he's mad.
I feel like wishing for exactly what a demon tells you to, and offering the one thing it wants, isn’t the smartest move. Especially since the reason it wants his eye is probably not just because it's "beautiful".
Then again, he’s trapped, and it’s not like he has many options.