Five hundred years ago, the dead demons seized the soul of Tianlu and began to invade the three major races of humans, eidolons, and sharks. The three races formed an alliance to fight against the dead demons. However, the army of the dead demons greatly increased in strength due to the power of the soul of Tianlu. The alliance of the three races retreated. At a critical juncture, a master craftsman forged a peerless sword named Wuyu.
The Wuyu Sword came out, and the color of the world changed. An unknown night spirit holding the Wuyu Sword fought against the five dead demons with one person's power, killing all the dead demons in the world. Finally, it merged with the Wuyu sword and turned into seven divine seals, forcibly sealing the five demons and the Lord of the Dead Demons. The battle ended.
Five hundred years later, the seal was broken, the Seven Seals were missing, and the Five Demons of Death returned. In order to protect their homeland, the young heroes of the three tribes joined hands again and embarked on a journey against the Demons of Death...