Flowing Blade-like Fire was the strongest fire-type Zanpakuto.
Kuryushiki Kenpachi's Zanpakuto, Gagaku Kairō, could be called the "strongest biological-type Zanpakuto."
Its Bankai's destructive power and range of destruction ranked foremost among all Zanpakuto.
Once Kuryushiki Kenpachi unleashed his Bankai, a city the size of Karakura Town would be destroyed outright.
It was a range of destruction that even Kuryushiki Kenpachi could not control.
If Ailin's "past self" had possessed Kuryushiki Kenpachi's Zanpakuto, Gagaku Kairō, back then, Ailin would not have needed to spend so much time fighting Iskandar, the King of Conquerors.
By directly releasing Gagaku Kairō's Bankai, he could have instantly killed Iskandar, the King of Conquerors, along with the fifty thousand soldiers within his Inner World.
Of course, for Gagaku Kairō to possess such immense power, its side effects were equally severe.
After Kuryushiki Kenpachi unleashed Gagaku Kairō's Bankai once, he needed half a year before he could release it a second time.
During those six months, Gagaku Kairō would fall into dormancy, unable even to use its Zanpakuto's Shikai.
Of course, for Ailin, even such severe side effects were acceptable for a Zanpakuto this powerful.
Besides, that was merely Gagaku Kairō's inherent flaw.
After Ailin modified it, if nothing else, Gagaku Kairō's dormancy period would certainly be shortened considerably.
Eager to find this powerful Zanpakuto within Unlimited Blade Works, Ailin bid Jūshirō Ukitake farewell and returned directly home, using Blade Zen to enter his own Inner World.
Black, red, and gold light converged and flickered throughout the space.
Of the three, golden spiritual pressure held the dominant position, while black and red spiritual pressure revolved around it.
The golden spiritual pressure was Ailin's own.
The black spiritual pressure was the magical power from the Holy Grail that Ailin's "past self" had brought back from the Type-Moon