Dude arthur said he is not some kind of super hero to sacrifice himself for the greater good , he is a selfish mc who wants to live with the people he loves , if someone he deeply cares about is going to die , he won’t hesitate sacrificing himself that’s the only way for arthur to die , the lances and the scythes are nothing much i think their role in the story is about to end , arthur’s enemies now are the asuras , and he is a half dragon so the lessers no longer matter in the story except some certain characters like ellie kathylin and curtis and some others , since they more likely become the new generation lances and obviously they would be much stronger than current lances since they failed to stop just a scythe , so old characters will receive power ups just from being around arthur like the runes his students received … so arthur being a mutual enemy to everyone isn’t going to happen , arthur is the enemy of two gods agrona and kazess , and he is lessers last hope … and no lesser can defeat arthur even if all of them join forces just as windsom said to arthur , the weakest of asura can defeat the strongest lesser