Hearing this, Chen Nianzhi's eyes flickered slightly, and he could not help asking, "When heaven and earth first open, boundless chaos aura permeates everything. Even immortals cannot endure it for long. How can acquired spiritual roots possibly be kept alive?"
"Moreover, living spiritual roots have not yet been refined into immortal treasures through secret arts. Their toughness must be far inferior to the Four Extremes Heavenly Pillars refined by the middle-grade method. How could they support the four poles of heaven and earth?"
"Ordinary top-grade acquired spiritual roots naturally cannot be kept alive."
Old Man Canglan nodded and said with a smile, "Only eighth-rank World-Opening spiritual roots possess the power to create heaven and earth. Only they can survive within a newly opened world."
"Eighth-rank World-Opening spiritual roots?" The immortals all revealed incredulous expressions.
To plant a World-Opening spiritual root at the moment heaven and earth first opened, and use it to support the vault of heaven, was itself an extraordinarily difficult feat.
World-Opening spiritual roots were incomparably precious. Each was worth at least ten times as much as an eighth-rank World-Opening immortal treasure, and any one of them could be called a supreme treasure.
Even among the Earth Immortal patriarchs present, the overwhelming majority did not possess a single eighth-rank World-Opening spiritual root.
If they obtained one, they would treat it as the foundation treasure safeguarding their own blessed land.
Many powerful Earth Immortal blessed lands pooled the strength of their entire sects and spent tens of millions of years cultivating them, yet they could often only nurture one or two eighth-rank World-Opening spiritual roots of this level.
It could be said that the value of World-Opening spiritual roots was simply beyond comparison with top-grade acquired spiritual roots.
Although top-grade acquired spiritual roots were rare, most Earth Immortal blessed