The Sage of Six Paths was truly the mightiest in the Naruto series, and could've even surpassed Kaguya at one point. Now, however, in Boruto, there appears to be an even stronger Otsutsuki.

Nagato's Six Paths of Pain was a powerful technique that proved nearly impossible to overcome. Some Paths are stronger than others, however.

Naruto Uzumaki, once an outcast, rose to become a legendary ninja, surpassing even Sasuke Uchiha. After the war, Naruto gained full Kurama power, Hashirama's cells, and mastered Six Paths Sage ...

The Sage of Six Paths was truly the mightiest in the Naruto series, and could've even surpassed Kaguya at one point. Now, however, in Boruto, there appears to be an even stronger Otsutsuki.

After Hagoromo gave Naruto some of his chakra as a gift during the Fourth Great Ninja War, Naruto gained access to Six Paths Sage Mode — which granted him the ability to use Yin-Yang Release.