Remnants of the previous demon king's army, I assume?
@Ihcky
It's what the Hero he loved would have wanted. And he literally came back to 'life' to get vengeance for her.
Besides. You know it will be twisted all to hell soon enough.
It was set up from the get-go that this was all he wanted and intended, albeit finding a way to revive the hero. It’s kinda funny that you’d be upset about this now.
@Ihcky but that's the way to go tho? He wants to put the threat looming over others' head. Going too far and he risks turning the whole continent into undeadland. He wants everyone to be united, fighting a common cause. Did you skip a chapter or sth?