@NeoLegion well think about it, its true that necromancy is already exist in overlord, but not as cool as shadowmancy of sung jin woo where they can regenerate like immortal and not to mention hundred thousands of them when he became a shadow monarch.
Secondly i want the time where he became a sucessor of the shadow monarch before he transported to overlord so there will be no leveling system.
And lastly, he has no weakness because not only he can summon shadows B rank as the weakest, he can also protect himself or maybe overwhelm them since he is also an assasin
