Perhaps due to Kusajishi Yachiru, or perhaps due to Zaraki Kenpachi himself, the Zanpakuto Zaraki Kenpachi had now formed not only lacked a name of its own, but also had no distinction between Shikai and Bankai.
Even the condition for releasing his Zanpakuto was not something he could initiate, but rather a passive release ability similar to Gerard's Schrift, "M - Miracle."
However, Gerard's Schrift ability, "M - Miracle," fully released its "Schrift" state upon suffering fatal damage, whereas Zaraki Kenpachi's condition for releasing his Zanpakuto was accumulating enough injuries in battle and raising his fighting spirit to a certain extreme.
As for the ability of his released Zanpakuto, it was... Undying!
After Zaraki Kenpachi released his Zanpakuto, his spiritual body would be forcibly pushed into a special state. Aside from his strength, speed, and spiritual pressure continuously increasing according to the intensity of his fighting spirit...
So long as Zaraki Kenpachi's fighting spirit had not been completely extinguished, his spiritual body would remain in this optimal slaughtering state.
In other words, unless Zaraki Kenpachi was crushed into despair by a completely irresistible force, he would be a beast that fought without end.
Under Chiba Makoto's gaze, as Zaraki Kenpachi and Gerard clashed again and again, his reddened body unknowingly swelled several times in size, while the strength, speed, and spiritual pressure he unleashed completely surpassed his previous state.
At this moment, calling Zaraki Kenpachi a beast was somewhat inappropriate. He was more like a vicious demon greedily reveling in slaughter.
The stronger his opponent, the more intense Zaraki Kenpachi's fighting spirit became, and the greater the enhancement he received.
Yet every ability undoubtedly had its limit. The battle between Zaraki Kenpachi and Gerard would undoubtedly come down to whether "fighting spirit" or "miracle" could endure until the very end.