For thousands of years, there have been two major factions of the Immortal Sect - Yunzhou Jiutian, which are at odds with each other. In the thirteenth year of Twilight, Jiutian was in decline, and the Demon Sect took advantage of the situation to attack, vowing to seize the Suotian Star. However, no one from the hundreds of immortal families came to rescue him. Ji Qiuyin, Princess of Jiutian, led the soldiers and civilians of Jiutian to fight alone with the Demon Sect for three days and three nights. They fought bloody battles, opened the seal of Suotian to pay tribute to the living beings, died together with the Demon Sect, and defended Jiutian. Both sides suffered heavy casualties, and the fire burned Jiutian City for ten days and ten nights, and Jiutian City was destroyed for a thousand years.