After returning to Konoha, Setsuna summoned Black Zetsu, having it stand before Madara.
"Try it," Setsuna's gaze shifted to Madara. "See if you can locate his true body's location through the will of Otsutsuki Isshiki within Black Zetsu."
Madara nodded slightly, pressing his palm against Black Zetsu's dark body. The Tenseigan on his chest lit up with dazzling golden light.
'This is the power of the Tenseigan? Chiaki Setsuna actually gave Madara the Tenseigan? How did he do that?' Black Zetsu was utterly shocked.
It had spent a thousand years creating the Rinnegan in Madara. Yet Setsuna gave Madara a power of the same level in just two days.
Before it could ponder further, Madara's Tenseigan locked onto a coordinate in the void.
"Found it." Madara waved a hand. The space before him suddenly distorted. A pitch-black spatial passage slowly formed.
"Let's go."
Upon Setsuna stepping into the spatial passage, the scene before him abruptly changed.
This was a dimensional space constructed from special chakra, filled with rugged, jagged valleys all around.
The moment they entered this domain, the master of this space quickly sensed the intrusion of outsiders.
A powerful Chakra abruptly descended. A man wearing a white robe, with a long braid trailing down his back, appeared before them.
Isshiki's gaze swept over Madara and Black Zetsu. "You two... dare to betray me?"
Madara sneered. "You were the one who Edo Tensei'd me of your own accord. I am not your subordinate."
Black Zetsu, hiding behind Setsuna, mustered its courage and shouted, "You want to devour Mother! I will never let you succeed!"
Isshiki frowned slightly, his gaze falling on Black Zetsu. "You actually know about this?"
Black Zetsu taunted, "That's right! I also know your name is Otsutsuki Isshiki!"
Surprise flickered across Isshiki's face, then turned into a cold smile. "In that case, I don't need to pretend anymore. That bitch Kaguya dared to betray me. I will absolutely not let her go!"
Black Zetsu angrily poked its head out from behind Setsuna. "Stop bragging! Setsuna-sama is here today to kill you!"
"Kill me? With just you few?" Isshiki laughed, as if hearing an utterly ridiculous joke.
But as he laughed, he suddenly noticed Setsuna's gaze remained fixed on him, making him inexplicably uneasy.
"What are you looking at?" Isshiki demanded sternly, a strange sense of foreboding rising in his heart.
Setsuna said calmly, "I am looking at your future."
"Nonsense!" Isshiki scoffed dismissively. "I know of no Dojutsu that can peer into the future!"
Setsuna fell silent, merely continuing to gaze at him.
In non-combat situations, Katakuri could foresee over ten seconds into the future. With his current Observation Haki far surpassing Katakuri's, Setsuna could foresee about a minute into the future in his normal state.
Jigen would be killed by him. Isshiki, parasitizing within Jigen, would be forced to revive using [Kama]. But Jigen's body was not a perfect vessel. Though the revived Isshiki regained his Chakra and power, he could only survive for two days.
In extreme rage, Isshiki's battle with him would destroy over half the Ninja World.
Setsuna frowned slightly, thinking inwardly, 'So, I must kill Jigen and completely destroy Isshiki's true body simultaneously.'
Thinking this, Setsuna said in a grave tone, "Madara, attack together."
As the words fell, surging Natural Energy rose around him. Sage markings appeared on his face.
Simultaneously, Black Zetsu flowed like liquid onto his right arm, transforming into a pitch-black armguard.
Seeing this, the corner of Isshiki's mouth lifted in a scornful arc.
"Putting on a show. He almost fooled me. Just a mortal who only knows how to swing his fists."
His gaze shifted to the Tenseigan on Madara's chest. "But you, Uchiha Madara, actually managed to obtain such power..."
Madara wasted no words. The Tenseigan on his chest abruptly erupted with blinding golden light.
"Golden Wheel Reincarnation Explosion!"
A massive golden light-sword tore through space, carrying an annihilative force as it slashed towards Isshiki.
Isshiki's black eye narrowed slightly. "Sukunahikona!"
A strange spatial fluctuation flashed. The light-sword capable of cleaving the Moon suddenly shrank a hundredfold as it approached Isshiki, merely grazing him lightly.
"What?!" Madara's pupils contracted sharply. "He can neutralize an attack like that?"
Isshiki sneered. "Only knowing how to waste power barbarically. What a waste of the Tenseigan in your hands. Better hand it over to me..."
The moment Isshiki's words ended, an aura that made space itself tremble erupted violently.
Eight Gates Released Formation: Gate of Death… Open!
Utilizing Black Zetsu's essence, Setsuna fully opened all Eight Gates for the first time.
Crimson steam shot skyward. Setsuna's fist, wreathed in black and red dual-color Haki, shattered space like glass wherever it passed.
Such exaggerated commotion shook Isshiki to his core. 'What kind of joke is this? This is power achievable through pure physical body?!'
'Not good!" Isshiki's expression changed drastically. 'Jigen's body can't withstand this blow!'
He frantically tried to summon his true body, but it was already too late.
That annihilating fist was already within reach.
A terrifying force wave crushed over Jigen's body. Even Isshiki, parasitizing within him, was pulverized by this dreadful power.
'Damn it, I still have power I haven't used...' Endless regret filled Isshiki's heart. His strength wasn't weaker than the opponent's.
Amidst the roaring collapse of space, Otsutsuki Isshiki turned to dust and vanished.
Witnessing this terrifying scene, Madara stood frozen in place.
"What level of power is this? And he still had the nerve to say he couldn't shatter space?" Madara's mouth twitched uncontrollably.
This was something even Setsuna hadn't anticipated. The stability of this dimensional space was far inferior to the real world.
"Good thing I wasn't stubborn earlier." Madara felt a surge of relief. Even with the Tenseigan's power, he was indeed no match for Setsuna.
Black Zetsu was equally shocked. Only by being attached to Setsuna's arm did it truly understand how terrifying that power was.
After the shock came jubilation.
'I am so strong! I, together with Chiaki Setsuna, killed Otsutsuki Isshiki! If Mother knew I killed her enemy, she would definitely praise me lavishly.'
After killing Isshiki, Setsuna looked around the dimensional space. "Madara, search if there's a Ten-Tails here."
Madara frowned slightly. "Otsutsuki Isshiki also had a Ten-Tails?"
Setsuna nodded. "But it's just a juvenile. Only a Ten-Tails that has devoured an Otsutsuki can grow into a complete form."
Though just a juvenile, it was perfect for him.
The Six Paths - Ten-Tails Coffin Seal required a Sage Body and Sage Eyes to perform. But for just a juvenile Ten-Tails, the requirements probably weren't as strict.
Moreover, what he wanted was merely the [Yang] power.
The Tenseigan on Madara's chest shimmered slightly, quickly locking onto the seal's location. "Found it."
He waved a hand, opening a spatial passage. Sealed inside was the Ten-Tails.
The moment the seal was released, the juvenile Ten-Tails let out a piercing shriek.
Setsuna gave it no chance to resist, directly binding it with chakra chains.
Amidst a blinding flash of light, the juvenile was forcibly absorbed into his body.
Black patterns appeared on Setsuna's skin. A phantom horn grew on his forehead.
But in the blink of an eye, these anomalies vanished.
Setsuna nodded, satisfied. He didn't want to turn into the strange appearance of an Otsutsuki.
"Success?" Madara asked.
Setsuna clenched his fist. "Yes. Though it's just a stunted Ten-Tails, it's enough to support my full-power battles."
While he couldn't open the Gate of Death infinitely, it was enough to incorporate the Eight Gates Released Formation into his normal combat system without the backlash being fatal.