Aizen is surrounded by the darkness and then attacked, the massive wave of spiritual energy slamming into him with the force of a collapsing star, causing him to plummet to the ground below. The darkness dissipates as Ichigo touches down on the ground, and the blue bands covering his face begin to crack and peel off, revealing the pain of his sacrifice. He stands near where Aizen crashes into the ground; he watches as a large gash running from the back of Aizen's head and down his back begins to heal itself, albeit slowly.
Ichigo is surprised that he's still regenerating. He goes to where Aizen is, but suddenly Ichigo's hair turns back to normal, and he returns back to his original form. Ichigo falls to the ground as he realizes his Shinigami powers are disappearing, the spiritual strength draining from him in a sickening wave of loss.
"Ha ha ha, you have lost Ichigo." Aizen stood up again with a crazy, relieved laugh, looking at Ichigo, his new, white wings tattered. He then pointed at his disintegrated Zanpakutō and added,
"Look, my Zanpakutō is disintegrating; it means Hōgyoku completely recognizes me, and it doesn't want me to rely on Zanpakutō anymore. Now my existence has become one with Zanpakutō."
While speaking, just as Aizen moved forward, his footsteps halted; looking, a shining, bright lock of golden light pierced out from his arm, and his face changed from manic triumph to utter confusion, then profound dread. At the same time, Urahara, his usual casual smile now sharp and serious, appeared in front of him.
"Kidō spell, when did you do it, Urahara?" Aizen asked, looking at Urahara with a sinking, horrified expression.
"I did it right before your complete transformation, at your most vulnerable state." Urahara spoke playfully, a hint of dark humor in his voice, looking at him, and then further explained,
"I knew it would be virtually impossible to kill you when you were fused with the Hōgyoku, so I especially created this spell to seal you."
Aizen nodded calmly, his mind desperately searching for a loophole, and then replied, yelling, "It's futile as I have already reached a new stage of evolution; Kidō can't stop me now."
Urahara looks on impassively as Aizen's Hōgyoku-enhanced form eventually begins to flake off of him, shedding like dry, worthless skin, much to Aizen's utter shock and disbelief.
Urahara explains that the seal he used was to activate at this moment: the moment when Aizen was weakening.
He simply utters, "The Hōgyoku no longer sees you as its master."
Aizen, at first in disbelief, then accepted and furiously yelled at Urahara and told him that he despises him.
Aizen hates that a man of Kisuke's intellect sits idly by and is controlled by "that thing!" Urahara realizes that Aizen is talking about the Soul King and comments that Aizen saw "it."
Urahara then says that the Soul King is the lynchpin holding Soul Society together, and if said lynchpin was lost, Soul Society would split and crumble.
A screaming Aizen counters with that being the logic of a loser and that he, a "winner," must think not about how the world is but about how it should be.
The seal starts to fully activate at last, the golden light constricting around his form. Aizen tries to free himself, his reiatsu thrashing violently, but he is too late as he is sealed into an odd, triple-sword device, his consciousness fading into silent, perfect containment.
After this happens, the Shinigami in the Fake Karakura Town and Ichigo's friends in Hueco Mundo realize that the battle is finally over.
"It seems you finally lost Aizen,"
Suddenly, an untimely voice, calm and utterly out of place, sounded. Eero, along with Nel, appeared in front of the now-sealed Aizen.
"Why are you here?" Ichigo asked in horror, looking at him, the fear not just of Eero's power, but of the implications of his presence.
"Who are you?"
Urahara also stood solemnly, adjusting his hat, looking at Eero and Nel alertly, his body tense and coiled, ready to strike despite his exhaustion.
Eero glanced at Ichigo and Urahara, also Yoruichi, who was standing far away, ready to strike him. He smiled, a genuine, unsettling smile, and spoke, "I am here to kill him. Do any of you want to stop me? I don't think you all are in such a condition to do that." His tone was a blend of absolute confidence and cold dismissal.
Urahara adjusted his hat, looking at Eero, and then spoke solemnly, "Although you look strong, I will advise you to stop; Hōgyoku is outside your imagination; releasing him may evolve him into another higher form."
Eero smiled playfully, looking at him, and then released his Zanpakutō. The gray sword materialized in his hand, a silent, absolute thing, and he spoke, "We will see about that. Reflection."
Crack!!!
Suddenly a sharp, splintering crack spread through the containment seal; at the same time, Urahara, Yoruichi, and everyone else's faces changed, contorting in a shared expression of sheer terror as the familiar, crushing reishi of Aizen reappeared, magnified tenfold.
'Idiot, bastard,' Both Ichigo and Urahara cursed, the thought a unified spike of desperate fury. Urahara picked up the fading Ichigo and flickered away with a desperate Shunpo.
"Ha ha ha, I knew it, you won't disappoint me,"
Bang!!!
Instantly, a loud, maniacal laughter sounded as the seal burst open in a blinding flare of gold and purple light.
Yoroichi, far away, glanced at the newly liberated Aizen with a sinking, utterly troubled expression, his mind reeling as he replayed Eero's words. 'Can this guy really deal with him? If he can't, then it will be a pain in the ass. His plan just broke the world.'
Urahara fell silent and started watching the development alert, the only sound the furious, insane laughter of Aizen Sosuke echoing over the ravaged land.
...