The Monkey Sage Mode is an empowered state that is only learned from the monkeys of Suhenmori Jungle. It can be entered by blending natural energy with one's chakra, creating senjutsu chakra.
Once in this form, Yamazaru grows a thick and robust three meter long tail, his already pronounced canines become even larger and his facial hair grows rapidly. He becomes much more monkey-like and will oftentimes walk on his knuckles and screech like a primate or beat his chest. Like all sages, he gets the markings that cover his face; his are golden.
The user's physical strength, speed, stamina, reflexes, perception, and durability are enhanced as well as their ninjutsu, genjutsu, and taijutsu. Ones can sense chakra, nature energy and can also control nature energy.
Besides showing animalistic tendencies and experiencing the increase in power that all sages enjoy, Yamazaru can freely and at any moment summon his monkey companions to fight alongside him; he even gains the ability to speak in their native tongue. His intelligence level skyrockets and he is able to perceive and analyze things he otherwise would not have been able to. Unlike other sages, ones using this form take on an enhanced sense of smell and hearing—this can potentially pose as a risk and backfire, however. Instead of being able to sense chakra in this form he can instead smell it, even through vast distances.