"What Is Filled" (埋めたもの, Umeta Mono) is chapter 651 of the original Naruto manga.
Summary
As Sasuke's Susanoo equips itself onto Naruto's Sage Tailed Beast Mode mantle, combining the two young men's abilities much to their shock, Kakashi, who is still in Kamui's dimension, is able to both see and hear what is going on via the link shared between his and Obito's paired Sharingan. Readying himself for one last all-out counterattack, Obito manifests a gigantic Yin-Yang shield and Hagoromo's legendary holy weapon, which he used to shape the world to ironically destroy the world he considered to be fake. Creating nine Rasengan in Kurama's tails, Naruto contacts his comrades from the Konoha 11 and Sai to join the fray. As they are enveloped by the chakra once more, they themselves don Tailed Beast Mode mantles much to their shock. Naruto charges them to break down Obito's defences using the Rasengan, so that he and Sasuke could have a direct shot at attacking him. As their attack is launched, a confused Obito begins to see even more of himself in Naruto and even begins to hallucinate about what his life would have been like even without Rin if he had returned to the village instead. Ultimately, the shinobi are able to break through his defence and the two young men are also able to deal a devastating blow to Obito with Susanoo's sword.