Sage Mode is the empowered state humans enter when they learn to draw natural energy inside them and blending it with their chakra. By doing so, the human creates new senjutsu chakra that allows them to enter Sage Mode. Sage Mode enhances the combat efficiency of the user by allowing them to tap into the natural force of the world that opens new techniques to the user and allows them to power up existing ones with the new senjutsu chakra.