There were four stages to cultivation–Spirit Stage, Body Stage, Life Stage, and Transcendence Stage.
While Pranic Beasts were born at the Body Stage and reached the peak of the Body Stage upon maturity, the Human race progressed through these four Stages, and once they reach the peak of the 10-Life Stage, they could attempt to enter the Transcendence Stage.
Becoming a Transcendent means to become an immortal existence with infinite lifespan. Of course, reaching this point meant the cultivator has reached the peak of cultivation. Hence, past this point, they cannot grow in strength.
Transcendents were an existence that could be considered a singularity. Their bodies, their mind, and their souls had fused to become one form. And the expression of that form was they, the Transcendent.
