For the Hercules Art, battle aura was a necessary "catalyst."
The principle behind the Cultivation Method was that external force—source power battle aura—stimulated and nourished muscle fibers, causing them to grow. Fundamentally, though, it did not need to absorb or consume battle aura.
To use a not entirely accurate example, it was like the dumbbells used for lifting weights. They stimulated muscle growth, but muscles did not grow by absorbing some substance from the dumbbells; they needed external force. As for dumbbells genuinely becoming lighter after long-term use, that was due to corrosion, oxidation, and other causes.
The "Essence Thread" condensed through the secret art of Thread Needle Thread was refined battle aura. Its greatest characteristic was that as long as his sea of qi did not run dry, it would not dissipate.
Rein tried guiding the "Essence Thread" through his muscles and was surprised to discover that, throughout the process, the battle aura remained condensed instead of scattering, making its consumption extremely low!
Previously, when he circulated battle aura to cultivate the method, after passing through only a few muscles, those battle aura particles, like loose sand, would scatter everywhere and vanish completely in an instant.
But after gaining this "Essence Thread" in his sea of qi, Rein was finally able to follow the diagrams in the secret manual and complete the first of those thirty-six inhuman movements for the first time!
As the Essence Thread traveled through his forearm, a faint burning sensation arose in the muscles. It felt like bioelectric stimulation promoting muscle growth. The pump was incredible, and surging human potential seemed ready to burst forth.
This Hercules Art truly had an extraordinary effect on increasing strength!
However, there was also one minor flaw.
A single "Gang Line" provided far too little stimulation to the muscles,