The Immortal Heaven Vein made his move, intending to save the Seven Emotions Sect Master, but Chen Xiao did not hesitate in the slightest. He directly brought out the Myriad Calamities Thunder Cannon.
Purple-gold lightning instantly flooded the starry sky. The faces of countless immortals changed drastically as they hurriedly retreated.
They had all witnessed the power of the Myriad Calamities Thunder Cannon. With merely two previous blasts, it had annihilated countless devils. Even terrifying devils of the Po Kong realm had been slain or blasted away.
Watching the Myriad Calamities Thunder Cannon poised to fire, the light in the Immortal Heaven Vein's pale golden eyes flickered uncertainly.
At his peak, he naturally would not have feared a full-force strike from someone at the peak of the Heaven-Piercing realm. But after the great calamity of the Primordial Wilderness, even the Primordial Wilderness Immortal World had been shattered, and the Heaven Vein itself had been battered into fragments. Its remaining strength was now only equivalent to the Heaven-Piercing realm.
Those in the Heaven-Piercing realm could freely travel through the various planes, breaking free from the constraints of their planes without needing to pass through their channels. For instance, anyone from the Netherworld wishing to enter the Immortal World had to come through the channel at the Source of Myriad Seas in the center of the Eternal Sea.
Without special means, it was likewise impossible to pass between the Black Death Domain and the Immortal World. The passage between the Heavenly Realm and the lower realms had once been the Three Realms Heaven-Piercing Tree.
But once immortals reached the Heaven-Piercing realm, they could immediately cast off the restraints between planes and travel freely among them.
The current Heaven Vein stood at precisely this realm.
The first realm of immortality was called Heaven-Piercing!