Jugo's Cursed Seal ability differed greatly from Sage Mode. Its effects were mainly reflected in physical changes. After activating Cursed Seal Level Two, the host not only gained senjutsu chakra, but their body also mutated, growing numerous new tissues. Their recovery ability increased drastically, making them practically immortal.
Under ordinary Sage Mode, although the power of ninjutsu increased, the physical enhancement was far inferior to Jugo's Cursed Seal mode.
Nawaki believed the main reason was that ordinary Sage Mode relied on spiritual power to fuse natural energy and chakra in a certain proportion before natural energy could be used. Once the body's cells absorbed too much natural energy, they would turn to stone and die.
Jugo's ability, on the other hand, used his body cells to directly absorb natural energy without any restriction on proportions, allowing him to use senjutsu chakra freely. However, his spiritual power would in turn be eroded by natural energy, driving him mad and beyond control.
Jugo himself had even developed a second personality filled with murderous impulses after being continuously eroded by natural energy over the years.
Therefore, Nawaki believed that if he could obtain Jugo's bloodline and combine it with Sage Mode, allowing his spirit and body to merge with natural energy, then he could achieve true fusion!
After all, according to the theory of qi cultivation, the body, chakra, and spiritual power respectively represented essence, qi, and spirit. Only by fusing all three with natural energy could a stable, higher-level energy possibly be formed!
That was right. Nawaki felt that so-called "senjutsu chakra" was extremely similar to the "spiritual power" found in immortal cultivation novels—a form of energy more advanced than chakra. Not only was it more powerful, but in terms of strengthening oneself, it was also stronger than the "true qi" Nawaki