For one to really become an immortal, one had to temper their bodies and fuse with their essence soul. Only then could they become true immortals.
Human Immortals could be considered immortals. However, it was more of a transitory phase.
This phase was neither too difficult nor too easy.
It all depended on one's level of tempering. The process was dangerous and painful. If one was careless, one might die from one's own immortal power.
However, if one spent more time and chose to temper it slowly, it wouldn't be too dangerous.
What one needed in the Human Immortal Realm was not a talent in cultivation. Rather, one needed the talent to control one's own strength.
Therefore, some people only needed four hundred years to reach the True Immortal Realm from the Human Immortal realm, while others could not succeed even after a thousand years.
There were even some who ended up stuck at the perfected Human Immortal realm.