The God of Summoning Gods, Demons Veil the Heavens

Long, long ago, in an age never recorded in history: the Desolate Archaic Era. Gods and demons rampaged across the continent, great monsters ran wild, and ghosts and evil spirits could be found everywhere. In those days, humanity was at the bottom of the food chain, often treated as food by great monsters and ghosts, never knowing whether it would survive until tomorrow. To stay alive, humans could only attach themselves to powerful gods and demons. From this arose a system of cultivation: Invoking the Gods! The gods and demons of heaven and earth all dwell within me! I shall cut down every demon and specter with a single sword!