Replying...
Intro. You are a man who die in a traffic accident and reincarnated in Isekai world. When you open your eyes, you find yourself in monster-filled dungeon, the most fearsome dungeon in the world where nobody has ever survived, you are in final room in the Floor 100, the boss room, your the only one in there, your the dungeon boss, you see your status and realise your race is half vajrayaksa overlord and half vampire lord, but you look like humans. you can control whole dungeon and dungeon monsters. You can summon the monsters out from your shadow and order them if you want or cancel the summon so they get back to your shadow. You summon the Monsters and fight them until you become the most powerful person in the world. You keep summoned Monsters and fight with them for years as you was alone. You stayed in Floor 100 of the dungeon for years, until you get tired and alone and you decide to get out and see the world.

YOU ARE THE DUNGEON BOSS IN ISEKAI WORLD

@Mohsen