Pure A-Shit Altar, a facility that had replaced the Dragon-Suppressing Tower after the Fifth Shinobi World War.
The altar itself was a powerful sealing device. Its primary seal was Black Zetsu, along with the 5,980 tons of shit-body that remained after the Fifth War.
When it came to nourishing the land, the Pure A-Shit Altar surpassed even the Dragon Vein.
But the altar's environment was harsh, and ordinary people were destined to be unable to approach it.
Even Yu had to wear the Ninja Kingdom's latest technological "hazmat suit" whenever he performed maintenance.
"Uchiha Riu, come out! I want to talk to you!!"
Black Zetsu's roar rose and fell with the waves of shit.
Outside the altar was a safe area large enough for people to stand on, but the boiling shit vapor mixed with falling shit hail... leaving even this sole safe zone with nowhere to step.
Tobi stood in a black robe amid the dazzling golden radiance.
"Tobi, is it really all right without any protective measures?" Yu approached in a thick hazmat suit, looking like an astronaut.
"I'm used to it." Tobi spoke calmly. "More importantly... this guy's Chakra is a little troubling."
"Hm?" Yu's brow abruptly furrowed. "I felt it—a kind of natural energy I've never encountered before... Could it be!?"
There was a trace of unwillingness in Tobi's voice, but also admiration for someone who had surpassed him on the same path. "He mastered it—the mode even I failed to grasp..."
"..." Yu's expression turned solemn.
He transformed all the moisture, stench, foul air, and other impurities deep within the earth into power and absorbed them into his body: Ksitigarbha Sage Mode!
If the Moon-Worshipping Sage Mode created by Tobirama had precedents in Takamagahara—
Then this Ksitigarbha Sage Mode had never been mastered by anyone