As everyone knew, using too many Immortal Crystals would cause the body to develop resistance.
After absorbing more than a million years' worth of Longevity Aura, the absorption effect would be reduced to only one-tenth.
After exceeding two million years, the efficiency would fall even further to one percent!
After exceeding three million years, it would drop to one-thousandth!
After exceeding four million years, only one ten-thousandth would remain!!
What kind of concept was that?
Lower-Grade Immortal Crystals, each containing a hundred years of Longevity Aura, were the most basic and important resource in demand in the Immortal Realm.
Ten thousand Immortal Crystals could extend one's lifespan to one million years!
One hundred thousand Immortal Crystals were needed just to extend one's lifespan from one million to two million years!
To extend one's lifespan from two million years to three million years required one million Immortal Crystals!
From three million years to four million years, it became outrageous—ten million Immortal Crystals were needed!
And extending one's lifespan from four million years to five million years was even more inconceivable, requiring a full one hundred million Immortal Crystals!!!
Normally speaking, three million years was the limit of an ordinary Heavenly Immortal's lifespan!
Beyond that, one's purse simply could not bear it. Even True Immortal lineages could not afford such a terrifying amount!
But the Flat Peach Tree's ten-year peaches were different!
They extended one's lifespan by ten thousand years without any weakening in efficacy!!
For Heavenly Immortals with less than a million years of lifespan, extending their lives by ten thousand years was worth only a hundred Immortal Crystals.
But for Heavenly Immortals over three million years old, a single ten-year peach was equivalent to one hundred thousand Immortal Crystals!!
Beyond that, it became even more outrageous.
Normally, a ten-year peach