Senin mod or hermit mode (仙人 モ ー ド) is a state achieved by mixing one’s own chakra with the natural one. It is everywhere, including in the air, which allows you to increase stamina to an unprecedented level. The nature chakra also opens up the possibility for the user to use new techniques related to the elements and melee. Such techniques are called "Senjutsu."
The study of the hermit
Understanding the secrets of nature and mastering the forces of Senin is possible on the territory of Mount Mioboku (toad style) and in the cave of Riuchi (snake style). In order to learn these techniques, you must have an incredible supply of chakra in order to be able to control natural jutsu. Also, for control, the hero must have a strong and healthy body. In the anime, it was shown that despite the fact that Orochimaru was able to comprehend the secrets of senjutsu, he could not enter the hermit mode.
Entering the Senin mod
The main requirement for the regime of the sage is absolute stillness. You can only collect natural chakra in full concentration. It is necessary to achieve a harmonious balance between one’s own body and nature. With an unsuccessful attempt to absorb the chakra of nature, the character begins to turn into stone. This is an excellent defense against shinobi that can absorb the strength of the enemy. When you try to absorb the natural chakra, it can also turn into a lump.
Entering the sage mode is also associated with changes in the body. Depending on the concentration level, shinobi may show signs of a toad or snake. That is why, when using this technique, Jiraiya partially turned into a frog - the nose was enlarged, the skin on the face turned red, warts appeared on the body.
Sage Power
The chakra of nature is a powerful enhancing ability, breaking the limit of the ability of any ninja. The levels of physical strength, ninjutsu and genjutsu increase many times in strength and penetrative ability. Senin mod is similar to the opening of the three "Heaven's Gate", but without harm to health.
A toad sage can make the chakra an extension of his body. In Naruto, the hermit’s regime was shown to be powerful and destructive against any enemies. The serpentine sage can breathe life into inanimate objects and merge with space. Hermit mode also increases the ability to detect the enemy, making it an ideal sensor. Even a blinded shinobi can feel the chakra around him while delivering precise and destructive blows.