"The dragon-patterned jade pendant that his parents gave him before they died in battle turned out to be the key to activating the dragon-patterned immortal body." The elder of Tianlong Cave who lived in Konoha only said one thing before his death: "Go and sign in to find the inheritance of the dragon." So, Ryoyuan signed in at the Dragon Pool in the Land of Waves to get the dragon's breath, and signed in at the Dragon Pillar in Amegakure Village to get the dragon's soul. Even the last page of the Tianlong Illustrated Book was hidden in Kaguya's sacred tree space.
When Obito started the Ten-Tails Resurrection Ceremony, his dragon pattern covered his whole body and turned into a thousand-foot-long dragon shadow: "The era of Otsutsuki's dominance is over." At the moment when the origins of the ninja world and the dragon world merged, everyone finally understood that the so-called Six Paths were just steps under the Dragon Emperor's feet!
