Muken.
The green Barrier flickered faintly, completely sealing off the Reiatsu of all three.
Yoriichi glanced at the Zanpakuto in his hand.
Hekyō remained in its initial state. No flames burned on its gray edge, and he had withdrawn his sun Reiatsu into his body.
"We can begin."
Unohana stood at the edge of the Barrier, the glow of Kaido appearing at her fingertips.
Kenpachi Zaraki grinned and abruptly shattered the ground beneath his foot.
"I've been waiting long enough!"
His massive frame appeared before Yoriichi in an instant, his Zanpakuto slashing diagonally down toward his shoulder with raging Reiatsu.
Yoriichi turned sideways to evade the blade.
Zaraki's sword struck the ground, cutting open a fissure dozens of meters long.
But his smile soon froze.
Yoriichi was already behind him.
There was no Shikai, nor any burst of Reiatsu.
Only a single thrust.
The gray blade pierced him from behind, slipping past his ribs and straight through his heart.
Blood dripped from the tip.
Zaraki's body froze in place, the excitement rapidly vanishing from his eyes.
His right hand gradually loosened its grip on the hilt, and his Zanpakuto fell toward the ground.
His heart stopped.
His Reiatsu dissipated.
He was dead.
Yoriichi pulled Hekyō free and turned to Unohana.
The next instant, green light covered Zaraki's entire body.
His stopped heart began beating again, and the wound in his chest rapidly closed.
A hand tightened around the Zanpakuto before it could hit the ground.
Zaraki opened his eyes.
"Hahahaha!"
He did not ask what had just happened to him. He turned and swung.
"That felt great! Again!"
Yoriichi held his sword horizontally to block the slash, retreating a slight half step.
His strength had increased.
Although the increase was not obvious, it was enough to prove that Unohana's method