It is said that since ancient times, the three realms of human, heaven and demon have existed in the world. The human world only seeks stability, and the two realms of heaven and demon refuse to give in to each other. In a battle between heaven and demons, the two realms of heaven and demon created several artifacts to eliminate each other. The demon realm's black magic stone was made by absorbing the souls of the human realm and was extremely powerful. The heaven realm created four soul swords, namely heaven, earth, love, and hate. In that war, all the artifacts were broken and scattered around the world, and no one knows their whereabouts to this day.