He only needed to inscribe a soybean-sized nen script dantian and a simple set of nen script meridians into an ordinary person.
Then he would first inject a hundred days' worth of true qi into that soybean-sized nen script dantian, forcibly compressing it into true essence.
Next, he would inject ten years' worth of cultivation, forcibly shattering the person's core to form a nascent soul. Then he would inject a hundred years' worth of cultivation, forcibly fusing the person's soul with their nascent soul to form a divine soul.
Following that process, Odin could spend less than two thousand years' worth of cultivation to accomplish the extravagant feat of raising an ordinary person straight to the earth immortal realm.
Setting aside whether an immortal created this way would be strong or weak, the question was simply whether they counted as an immortal.
Of course they did, and they could also gain the same long lifespan as those who became gods through a godhead in this world.
Their maximum lifespan might only be a few thousand years, but they could replenish it.
As long as they did not die, they could live on and on just the same.
In a conventional cultivation world, an immortal like this could overpower opponents through the sheer advantage of their realm.
But that would not work in Odin's current world, because it contained Nen, a high-level energy that could inherently interact with concepts.
Netero, who was now in the golden core realm, also had a lifespan of several thousand years.
But if Netero fought this ordinary person forcibly raised to the earth immortal realm...
That earth immortal would not last a single blow against Netero. That was the difference.
"So you have to start stockpiling true essence again?" Ponzu asked in surprise.
"Yes." Odin sighed.