To be honest, Ye Tian felt that a divine technique like the Underworld Seal would not be overrated even if it were called an Earth-grade immortal art.
It could not only neutralize all immortal arts, but also turn them into its own power and use them to wound the enemy.
An immortal art that made enemies die faster the fiercer and stronger they were was invincible no matter how one looked at it.
Ye Tian had once thought that such an immortal art had no weakness.
But if that were truly the case, then a cultivator possessing such an immortal art should have been invincible, and the Zhang Family should have become a top-tier great clan.
In reality, the Zhang Family's status and strength could not compare to the Lin Family's, and no one had coveted this supposedly invincible immortal art of theirs.
That meant the Underworld Seal must have weaknesses he did not know about.
With a crisis of life and death hanging by a thread, Ye Tian erupted with all his potential.
His mind raced at high speed, and his thoughts became extraordinarily clear.
After some thought, Ye Tian truly inferred the flaw of the Underworld Seal.
The most important point was that the Underworld Seal likely consumed an enormous amount of immortal essence. It might even tie up part of the immortal essence, preventing it from being freely used. That was why Zhang Lie Feng had been unable to attack or defend with his full strength.
This had also laid the groundwork for that Dao Venerate realm cultivator's death.
Another crucial point was that Ye Tian figured out why Zhang Lie Feng's body would occasionally pause for an instant.
He noticed that those brief, unnatural moments in Zhang Lie Feng's movements had all appeared after he was