Legend has it that on the night of the "Blood Moon Devouring the Sun", the "Twilight of the Gods" event occurred that shocked the entire continent.
The contemporary "Martial God" of the Mercenary Union, the "Spellweaver" of the Mage Union, the "Shadow King" of the Assassin Union, and the other strongest deputy in their respective unions - a total of six demigod-level beings who stand at the apex of mortal power, join forces to break into the "Land of the Fall of Gods" located in the rift of the world, with the intention of killing an awakened ancient evil god.
The outcome of that battle, no one knows.
People only saw the sky being stained with blood, and the stars falling like rain, which lasted for three days and three nights.
Since then, the six most powerful men, together with the evil god they wanted to assassinate, have all disappeared without leaving any trace.
Some people say that they succeeded, but at the cost of their lives; some say that they failed and turned into nutrients for the evil god; some even say that they actually died together, their divine power collapsed, and they returned to the origin of the world.
The truth is forever buried in the dust of history. As a result, the three major trade unions were severely weakened and fell into three years of power chaos and power reshuffle.