A powerful and proficient sorcery can be directly embedded deep within one's spirit.
Even strong protective divine skills can be embedded within one's flesh.
This includes speed, secret techniques, and attack methods, among others.
With the functionality of the "core management spirit core" embedded in the spirit, all spirit cores throughout the body can be freely controlled without any delay or unfamiliarity.
Thus, the essence of life has deeper significance; otherwise, the spirit core mode could even mass-produce high-level warriors in a short period of time.
But, even so, a warrior who can focus all their energy on enhancing their transcendental life through their spirit is far easier than an ordinary transcendent being.
The core management spirit core is extremely powerful in this respect as well.
The key requirements are basically potential, resources, and time.
