MC is the Shadow Monarch chosen to be the next reincarnation because he was reckless to the point where he almost died b4 his reawakening. so being the Monarch of Death he can rules over all of undeath. the other world class S ranks borrow their power from a monarch but MC actually is A Monarch. That is why the blacklady who could boost the powers of awakened S ranks was so scared of him. she only saw a glimmer of a Monarch before but she saw "A Monarch" n it scared her to the core.
I mean, I think it would have been useful for MC to get the Arch Lich. Also, seems there's another shadow monarch? Excited for the interdimensional battles.
I feel bad for thoose student who is dead by the orcs like they were all lying in the hallway with blood all over the place, well i hope the casualty is minimized