This could be glimpsed from the "monsters" created by the two White Saints!
The Deathless created through the Yang White Saint's exposition of the Dao had already achieved a perfect "balance of life and death" at the level of "form," yet they had not reached the level of "spirit."
More than nine hundred years ago, when Shen Mo had still been an Appearanceless Realm cultivator, he had accepted the request of Kong Ce, the True Immortal Ancestor of Immortal Bamboo Island. Together with Fairy Yuquan, Daoist Jinguang, Xuanyuan Di, Venerable White Crane, and other True Immortals of the Immortal Alliance, he had traveled to Immortal-Abandoned Ridge in southern Zhuji Continent to investigate the secret of the Forbidden Land that had descended there.
Afterward, they discovered that this "Forbidden Land" was the Spirit Ruins World, which had appeared many times throughout history in the Heaven-Patrolling Domain of the Primordial World in the form of the Ancient Immortal-Demon Battlefield.
Unlike before, a vast number of Deathless had emerged within the Spirit Ruins World.
They were tainted by the dense aura of the Gui World, yet they also contained immense vitality. Their appearances were even stranger, alternating between the forms of corpses and living people, as though they stood between life and death.
When Shen Mo and the other immortal Dao powerhouses fought these deathless monsters, they discovered that ordinary methods could scarcely destroy them completely.
The Deathless whom they had "killed" through all manner of methods quickly returned to normal. Meanwhile, Shen Mo's and the others' killing techniques—sword light, immortal arts, divine abilities, artifacts, great formations, and the like—were gradually dimmed and dissolved after being tainted by the Gui World's aura.
Even then, they had made a conjecture.
They believed that the master of the Spirit Ruins World had grasped a trace