The Zhu Xian Sword Formation truly deserved its reputation as the number one immortal formation in all Myriad Worlds, its fearsome renown underscored by the complete deaths of two Golden Immortal Dao Ancestors.
Star River Dao Ancestor had integrated the Innate Sacred Virtue Great Dao, untouched by all laws. He was a mighty figure at the second step of the Golden Immortal realm and had attained the Dao over a hundred thousand years before Daoist Yujing. Before Dao Ancestor Yin Yang Qingyunzi fell, among Yuyu Heaven's four Golden Immortals, he was universally acknowledged to possess the deepest Dao practice and the greatest strength.
Primordial Demon Ancestor was the most outstanding, most gifted, and most dazzling figure since the birth of the demonic path. The Evil Great Dao he had integrated was one of the few Acquired Great Daos close to an Innate Great Dao, for like an Innate Great Dao, it could evolve many Acquired Great Daos—Inner Demon, illusion, dreams, devouring, plundering, blood, and so on. Though he still stood no chance whatsoever against an Innate Dao Ancestor—even dozens of Primordial Demon Ancestors would fare no differently against one Innate Dao Ancestor—with an Innate Dao Ancestor working alongside him, his Primordial Sky Demon Qi, myriad Inner Demon and Illusion Demon immortal arts, and the like could exert an exceptionally powerful restraining effect.
Yet even these two Dao Ancestors, each mighty in their era, had completely perished within the Zhu Xian Sword Formation when they joined forces. Its aftershock had nearly destroyed Yuyu Heaven, one of the Myriad Worlds, in its entirety.
The might of the Zhu Xian Sword Formation needed no further elaboration, nor any Heavenly Flowers Falling praise. On this point alone, there could be no dispute over its title as the number one immortal formation in all Myriad