Chen Nianzhi could not help but frown slightly upon hearing this.
The Primordial Spirit heavenly barrier was unlike the mana heavenly barrier. After all, the Primordial Spirit was exceedingly fragile, so one naturally could not crudely rely on ordinary external objects to forcibly break through its limits.
Within the Three Thousand Immortal Domains, there were three mainstream methods for breaking the Primordial Spirit heavenly barrier: Great Luo wondrous arts, divine soul immortal medicines, and the path of incense offerings.
Of these three methods, whether it was the first or second, compared with the methods, pills, and rare treasures used to break the mana heavenly barrier, they were far gentler and slower, and their effects were naturally greatly diminished.
Generally speaking, both Great Luo wondrous arts and divine soul immortal medicines were incomparably precious. Divine soul immortal medicines capable of helping one break the limits of the Primordial Spirit started at a minimum price of one or two hundred strands of innate qi.
Moreover, the overwhelming majority of these costly divine soul immortal medicines could only help the Primordial Spirit break through its limits seven or eight times, making it difficult to breach the crucial ninth limit.
Countless Four Tribulation Ancient Immortals had exchanged their lifelong savings for divine soul immortal medicines, then acquired Great Luo wondrous arts to use in conjunction with them, only to remain trapped at the Eight-Limit realm, unable to complete their final transformation.
This showed just how difficult it was to break through the Primordial Spirit heavenly barrier. This step was far more arduous than breaking through the mana heavenly barrier.
Therefore, quite a few Ancient Immortals of the Three Thousand Immortal Domains ultimately chose the third method: the path of incense offerings.
As something formed from the aspirations of all living beings, incense offerings were