Behemoth

The king raised his head, light blue flames tore through the sky, thunder exploded in the distance, the mushroom cloud did not rise as usual, the sky grew bright, then darkened, and the curtain fell... Humanity is utterly defeated. People call it [Black King] From that day on, the beast came. Behemoth is a general term for something beyond the records of civilization. Fortunately, humanity did not die; People say it is a king's bond. Behemoths did not exterminate humans. Some say this is the beginning of misfortune...