Kei was momentarily stunned when he saw the system reward. If it were just an ordinary green-tier trait, he wouldn't even care.
But this was different. As long as it absorbed enough energy, it could upgrade itself. That wasn't something a mere green-tier trait could compare to.
Moreover, it directly enhanced the energy capacity limit, absorption efficiency, and conversion rate, which were extremely crucial attributes.
There was just one problem... Wasn't this basically encouraging him to devour the entire little planet?
He couldn't pack it up and take it with him. Did he really have to consume it completely and then destroy it?
What kind of nonsense was this?
Even though the population of the Naruto world wasn't as large as it used to be, it was still no small number.
Was he about to reach the level of an S-rank war criminal? Or even surpass that limit?
He grumbled inwardly, but after checking the upgrade conditions, he chose to activate it with a pragmatic mindset.
Hagoromo had left behind an enormous amount of Six Paths chakra, like a massive lake. Shibai, that guy who had devoured countless chakra fruits, had left a corpse that should still be on this planet. And besides, the Ōtsutsuki clan should still have quite a few members left.
Their habit of planting God Trees everywhere meant there were likely many hidden treasures.
System, activate [Star Devourer].
Kei immediately felt a subtle transformation in every cell of his body before everything quickly returned to normal. The system-imbued visuals allowed him to instinctively grasp his new trait.
With a single breath, an immense influx of various energies surged toward him.
Natural energy, chakra, planetary energy, life energy...
Kaguya, Tsunade, Kushina, and even the recently healed Madara and Hashirama all turned to stare at him.
He hurriedly deactivated [Star Devourer], suppressing the urge to recklessly absorb all the energy from this world.
At first glance, this trait didn't seem to have direct offensive capabilities. But since [Evolutionary True Sovereign] already gave him a high energy absorption rate, and [Star Devourer] further enhanced that, he could now absorb almost all jutsu and bloodline limits, including bloodline selections, almost instantly.
That included the senjtus energy and natural energy that even the Ōtsutsuki clan couldn't directly absorb, as well as negative energy.
His gaze shifted toward Kaguya.
If he had this trait earlier, he could've given her an entirely different kind of death, by draining her of every ounce of energy.
Kaguya immediately reacted. Noticing Kei's malicious gaze, she swiftly flung Black Zetsu from her sleeve, using him as a shield in front of her.
"Father! I've changed my name!" Black Zetsu cried out to Kei desperately. "I'm not Black Zetsu anymore, I'm Yamanaka Zetsu! Really!"
"What the hell?" Kei watched as Black Zetsu tried to squirm away from Kaguya's grip, only to be completely immobilized by Yin-Yang Release.
Tsunade, Kushina, and Hikari, who had just arrived from the distant barrier, each reacted differently to Black Zetsu's shocking words.
Tsunade looked at Kei with absolute disgust. "Since when did you become this thing's father?"
Kushina barely managed to stop herself from bursting into laughter.
Hikari tilted her head, her curious eyes darting between Kei and Black Zetsu. "Are you really his father?"
"Stop overthinking it," Tsunade said impatiently. "That thing was probably just groveling the whole time, calling him 'Father' and making up excuses to save itself."
"Oh~" Hikari's eyes widened. "Did you actually let him call you that while you were alone with Kaguya? Did she scream?"
"What? No!" Kei responded, confused.
Tsunade and Kushina immediately looked at Hikari in shock.
But when they caught a fleeting glint of mischief in her gaze, they both twitched. This little girl... she was definitely hiding a dark side!
Meanwhile, Kaguya, who had her view blocked by Black Zetsu, didn't see Hikari's expression. She genuinely thought the girl was just that blunt.
Remembering how she had nearly lost control inside that bizarre barrier, she felt an overwhelming mix of embarrassment, anger, frustration, and helplessness. In response, she mechanically rotated her head 180 degrees, so no one could see her face.
"Stop messing around." Kei flicked Hikari's forehead.
Talk was cheap, many people ran their mouths like alpacas, but those who actually followed through with action were wolves. He wasn't that ruthless. At most, he'd just give Kaguya a taste of his healing, forcing her to experience the brink of death once.
"Is it over now?" Hashirama had finally regained some of his strength and curiously walked over to ask.
"There's one last thing left." Kei's gaze fell upon the God Tree.
Madara, who had also stepped forward, shot Kaguya a wary look before reactivating his Perfect Susanoo. The massive Susanoo appeared and raised its chakra blade, slashing at the branches of the God Tree.
A trace of unwillingness flashed through Kaguya's eyes. But with Kei present, she suppressed her instincts, closed her eyes, and forced herself not to witness the scene of the God Tree being severed.
The towering tree was cut down at its roots, reverting into the Ten-Tails. It let out an ear-piercing, agonized wail.
Kaguya's aura plummeted instantly. The Rinne Sharingan on her forehead slowly closed before vanishing completely.
The Six-Tails and Seven-Tails, previously trapped within the Ten-Tails' body, struggled desperately to break free. White Zetsu, who had been connected to the God Tree, began collapsing in large numbers the moment it was severed.
Kei suddenly thought of Tobi.
Following the Flying Thunder God mark he had placed on him, he instantly appeared by Tobi's side.
"K-Kei! I-I'm g-g-gonna die! P-Please s-save me!" Tobi wailed like a ghost the moment he saw Kei.
"..." Kei closed his eyes, suppressing his irritation. This guy had been loyal and hardworking for so long, he supposed he owed him at least this much.
With a flick of his hand, he used Yin-Yang Release to sever Tobi's connection to the God Tree while replenishing the life energy he had just lost.
Surveying the scene, he saw countless White Zetsu withering into lifeless trees.
With a wave of his hand, he used [Infinite Armory Domain] to collect nearly a thousand White Zetsu, and sealed them temporarily.
Orochimaru had already researched the White Zetsu extensively, but they still had many uses and took time to manufacture. It was better to keep some as spares to save trouble in the future.
Grabbing Tobi, Kei reappeared in front of Tsunade and the others.
Kaguya, who had initially wanted nothing to do with the group, suddenly turned around the moment she sensed Tobi's presence. As she turned, her body faced forward first—then her head followed, rotating unnaturally.
Tobi responded instinctively.
Then, as if realizing what he had just said, his expression became exaggeratedly horrified, clutching his face in shock. "W-Wait, why did I just call this weird woman 'Your Highness'?! Kei! You have to believe me! The God Tree was controlling me! I never betrayed you! I swear—ahhh, I'm doomed..."
Kei raised an eyebrow. He quickly searched his memory for the name Aizawa and soon recalled its origin.
Then he thought of the "Attendant" career displayed on Tobi's personal status panel.
Understanding dawned on him.
Kaguya, now weakened to less than half her former strength, widened her eyes slightly. She barely managed to condense a faint light of Yin-Yang Release, which she sent into Tobi's body.
The loud, frantic babbling stopped abruptly.
Tobi's lone eye stared blankly at Kaguya.
Memories from a thousand years ago, memories of being sealed away for a millennium, gradually resurfaced.
Tears welled up in his single eye, streaming down his face.
"...Your Highness, you're safe... that's all that matters..."
"Mm." Kaguya responded softly. Her usually cold and distant expression melted like ice under the sun, revealing a faint, gentle smile.