Within the Cliff Cave Mansion, Lin Yi employed the Eye of Emptiness to begin examining his own body, the essence of what the Eye could see closely related to his cultivation level.
The higher the realm, the deeper the essence one could perceive.
Previously in the Dao Palace, with the Eye of Emptiness at the Huashen realm, he sensed traces of Otherworldly Aura, yet he was unable to see it.
Now that he had reached the Refining Void Realm, perhaps he could see this mysterious Otherworldly Aura. Once seen, he could find ways to shield, and even erase it.
Of course, he wouldn't arbitrarily erase this Otherworldly Aura, considering its beneficial effects on the body during Heavenly Tribulation.
After activating the Eye of Emptiness, Lin Yi, guided by the destiny's lock-on sense and previous traces felt, delved deeper into his investigation. At last, he discovered a strand of grey aura within his body.