Three things came to mind:
1. Awesome threat against the king!
2. The hero mentioned, how the demonking managed to still escape his reach in matters of power. Maybe he did acctually reach him or nearly reached him and became a threat to the demonking, but the demonking had a nasty trick up his sleeve. A theory: What if the demonking can boost his and his underlings power by raising the difficulty setting? Maybe the conflicted started on easy, but the side of DK started to lose, the tides turned against him, but he found a way to turn all over again, by manipulating the magic-system of this world. His side got the upper hand yet again, but the humans gained stronger talents and magic in return and a much stronger 5-Star Hero was born. DK's side would have started to lose again and he put everything onto a gamble: Finding the next hero and killing them, before they becomes too strong. Well, on the last part: Mission failed.
3. There is trouble in paradies. See how tearful and joyful Berserker-Swordgirl jumped MC? And you definitly also saw the panel filled with Axeboy's frustration. A applaude Axeboy's actor abilities. I thought he definitly should have a thing for the girl after they trained with each other for so long. It would have surprised me, if not. But than, after they all reunited, there was nothing. Not a hint, I can remember right now. Until now. He has got me fooled. I really though he was cool with the situation. He isn't.