Six Paths Senjutsu

The Six Paths Sage Technique is an empowered state similar to Sage Mode which drastically empowers all of the user's abilities to a far greater extent by apparently combining Senjutsu and and the chakras of the nine tailed beasts. However, the technique is unique in that the user user lacks the traditional pigmentation around their eyes that Sage Mode would traditionally entail. The reason for this is unknown however.

Capabilities
During the Fourth Shinobi World War, Naruto somehow managed to rekindle Guy's extinguishing chakra after the latter unlocked all of the Eight Gates. Naruto's physical abilities were also bolstered to the point where he was able to overwhelm the revived Madara in his Ten-Tails jinchūriki form, forcing him to absorb the entirety of the Shinju.

Nine-Tails Chakra Mode
Naruto can extend the capabilities of the Six Paths Sage Technique by further drawing on the chakra of the nine tailed beasts, which causes Naruto to don a new variation of his Nine-Tails Chakra Mode which is immensely more powerful in comparison. In this new mode, like his original Tailed Beast Mode cloak, the chakra forms into a light-coloured coat but with a dark-coloured bodysuit underneath. The "bodysuit" covers his torso, reaches down his arms to the knuckles, and down his legs, stopping just above his sandals. It has a light colored circle where the original seal was placed as well as magatama around his collar. The coat has the typical markings of the Six Paths Sage Technique, a Rinnegan above nine magatama, on its back. Furthermore, Naruto is able to manifest the Truth-Seeking Balls, wielding two of them as short staffs. His speed is immensely increased as well to the point in which he can match Sasuke's instant teleportation by running.

Ten-Tails jinchūriki form
Madara stated that he posessed this Technique. Whether this is purely from becoming the Ten-Tail's jinchuriki, or having prior absorbed Hashirama's Sage Mode is unknown.