Outside, just as that black heavenly lightning vanished into thin air...
At the same time.
A heaven-shaking roar rang out within the Secret Realm!
Boom!
Within the incomparably dense layers of dark clouds, a terrifying bolt of black lightning suddenly flashed forth!
It was at this very moment.
Inside the Secret Realm's Teleportation Room...
Cheng Buzheng, seated cross-legged on a cushion, withdrew his gaze from the [Chaos Dao Tribulation Sword] and instead looked up into the void ahead.
Golden light flowed through his eyes, lending him an air of immense majesty.
It was as though his gaze could pierce through layer upon layer of obstruction and behold the sudden upheaval outside.
Cheng Buzheng's brows drew together slightly, only to swiftly relax again.
He murmured inwardly:
"Heavenly Dao resonance?"
"Even within the Secret Realm, it cannot completely cut off the heavenly signs of a Spirit Treasure's birth?"
This development!
Both surprised Cheng Buzheng and fell somewhat within his expectations.
Yet he also understood that the black heavenly lightning coiling amid the boundless dark clouds was precisely the legendary [Spirit Treasure Lightning Tribulation].
Only by passing this tribulation could the [Chaos Dao Tribulation Sword] fully advance into a Spirit Treasure.
Should this [Chaos Dao Tribulation Sword] fail to withstand the lightning tribulation's baptism, its momentum of advancement would inevitably be interrupted. Naturally, it would then be unable to seize creation from the black heavenly lightning, and thus could not give birth to the spirituality that formed the crucial core of a Spirit Treasure.
Likewise.
A Mortal Cultivator could not intervene to weaken or block the [Spirit Treasure Lightning Tribulation] for a magic treasure in the midst of advancement. The magic treasure undergoing sublimation had to receive the lightning tribulation's baptism in its entirety.
As thoughts stirred.
Countless distracting thoughts flashed through Cheng