The arena shook violently as Naruto and Goku faced Void. Both fighters knew that fighting separately would not be enough. They needed more than power — they needed together.
"Goku… we need to combine our powers!" Naruto shouted.
Goku nodded, a grin spreading across his face. "Right! Let's do it!"
They touched fists, energy mixing like fire and water. Golden chakra intertwined with blue ki, forming a new aura, blinding and immense. They both felt their power increasing exponentially.
Kurama's voice echoed inside Naruto:
"This… is incredible. But controlling both powers will be dangerous."
Goku laughed. "I like dangerous!"
Void observed silently, his wings folding back slightly. "Interesting… two warriors thinking they can match me. Let's see if your arrogance will survive."
The fusion was complete. Naruto and Goku were no longer separate — they had become UzuSai Legend Mode. Their aura stretched across the arena like a living sun, their energy bending space itself.
They charged at Void together. The first clash shook the dimension. Mountains shattered. The ground cracked like glass. The wind blew so hard that the remnants of the arena scattered.
Void smirked, summoning shadow blades from thin air. "Impressive… but I have waited a long time for this."
The blades pierced the Fusion. Each strike drained some of their energy. They countered with a giant Rasengan-Kamehameha hybrid attack. The energy collided with Void's shadows, exploding in a massive shockwave that lit the whole arena.
Void stumbled back, momentarily impressed. "So… this is the fusion of two worlds' mightiest heroes… I must admit, it's beautiful."
The Fusion pressed forward, hitting Void again and again, forcing him to retreat. But suddenly, Void's laughter filled the arena.
"Do you really think you can stop me?" He lifted his arms, and the arena sky split open. Through the crack, two parallel worlds began to merge, and cracks appeared in the ground.
Naruto's heart sank. "No… our fight is destroying reality!"
Goku's eyes widened. "We can't let this happen!"
Void's voice echoed, cruel: "Perfect. Now your power feeds me! Continue your battle… and see who falls first!"
The Fusion realized the danger — their combined power, if uncontrolled, could destroy both their worlds. But there was no turning back.
Kurama whispered, "We can't hold it much longer… we must decide: push all out… or lose everything."
Goku grinned through the worry. "Let's show him our ultimate attack — together!"
They combined their energy into one massive orb. It shone brighter than a sun. The orb raced toward Void.
Void raised his hands — a barrier formed — but the orb broke through, exploding in the arena with unstoppable force.
Void staggered back. His wings burned. "Impossible…"
For the first time, Void looked worried.
But the arena began to crack dangerously. The Fusion realized the ultimate consequence: if they push this much power again, the arena itself might collapse, trapping them and destroying everything.
The Fusion shared a glance. They knew the next strike would decide everything — life or death, for their worlds, and for themselves.
The Fusion's eyes glowed. Naruto and Goku's voices joined:
"Together… we fight to the end!"
The energy surged. The sky cracked even more.
And somewhere, hidden in the shadows… Void whispered:
"The final stage… is about to begin."