The True Power of the Nine-Tails

The moment Uzumaki Naruto rose from the ravine, the light across the entire wilderness changed.

It was not a thicker chakra cloak, nor a simple increase in power. It was a qualitative transformation. Golden light poured from within him, no longer merely covering the surface of his skin as before, but becoming one with him. His hair stood on end, turning an even brighter gold. Nine tails formed of condensed chakra appeared behind him, each one flowing with energy like liquid sunlight. His eyes were no longer blue, but golden, with horizontal slit pupils that carried a majesty beyond humanity—yet one that inspired no fear.

Kakashi stood in the distance, the Sharingan in his right eye spinning wildly as he tried to comprehend the change in Naruto. He could sense the density of that golden chakra—it was not an increase in quantity, but a change in quality. Like iron and cotton of the same size, yet entirely different in weight. The "weight" of the chakra Naruto was giving off now had already surpassed anything Kakashi had ever known a shinobi to possess.

This isn't Nine-Tails Chakra Mode... It's a further, deeper fusion. Kakashi made the judgment swiftly, but he did not know what to call this state. He had never seen such a form in any record. The Fourth Hokage had never attained it, nor had any Jinchuriki throughout history. Naruto... what exactly happened between you and the Nine-Tails?

Guy stood beside Kakashi. The green chakra vapor had completely dispersed, and his right leg trembled slightly—the barrage of attacks just now had drained his stamina. Yet his eyes never left Naruto's back, and a weary but gratified smile appeared on his sweat-soaked face. "That brat... seems to have changed."

Killer B's Eight-Tails form remained at the threshold of partial Tailed