Six Paths Chakra

Hagoromo Ōtsutsuki, otherwise known as the Sage of Six Paths, possessed a very unique type of chakra when compared to others. Those who become hosts of the Ten-Tails can gain access to this type of chakra. It's properties however seemingly extend beyond Senjutsu and the chakra of the nine Tailed Beasts. Hagoromo transferred this chakra to Naruto and Sasuke when they were near death, allowing them to receive the Six Paths Sage Technique and Rinnegan respectively. They also gained special tattoos each containing unique portions of Hagoromo's chakra.

Effects
This chakra can cause a Tailed Beast Mode (so long as the host carries the power of all nine Tailed Beasts) to evolve in a Six Paths Sage Technique and a Mangekyō Sharingan to evolve into a Rinnegan. This chakra also allowed Naruto and Sasuke to directly harm Madara when he was the Ten-Tails host, the latter of the two even bisecting him despite not having any Senjutsu training. Those who carry this power also have the ability to sense anyone else who also possesses it.

Obito used this power, after stealing it from Madara, to create his own Truth Seeking Ball despite no longer being a Ten-Tails host. This very same power was temporarily given to Kakashi when Obito transferred his chakra to him as a spirit during the former's battle against Kaguya. This chakra amplifies the power of any jutsu and also changes it's color as seen with Sasuke's Chidori and Kakashi's Raikiri.

Incredible feats can be achieved when this chakra's Yang Release and Yin Release are combined, such as creating form from nothing and breathing life into it or unleashing a massive fuinjutsu capable of sealing a being as power as Kaguya.