The whites of his eyes turned black, a third eye appeared on his forehead, and mysterious purple markings emerged across his face. His hair grew exceedingly long, while his clothing transformed into a robe-like outfit, black overall, with white covering the chest and lower body.
A diamond-shaped "crack" appeared in his chest, the purple Hogyoku suspended within its "hollow." Four diamond-shaped crystals floated around the Hogyoku, forming the shape of a cross.
Behind him, three pairs of mirror-like crystal wings hovered in the air, forming a winged arrangement brimming with divinity.
His arms no longer had upper sections; only the lower halves floated in place. White gloves served as his arms, their ends adorned with eye-like ornaments, yet this did not hinder his control in the slightest.
The lack of upper arms seemed to signify that this man was no longer bound by any restraints. Within those hollow gaps was not flesh and blood, but a profound void, as though his body contained an entire starry universe.
It was an ultimate realm that surpassed demons and even gods.
This was Aizen's true strongest form, a design created by the original author himself.
He had completely fused with and mastered the Hogyoku's power, merging his Zanpakuto with it as well, achieving a truly ultimate form.
In the official descriptions of the original work, this form was called the fearless realm that commanded all creation. It was a conceptual existence capable of turning illusions into reality and reality into illusion. Calling him a Concept God powerful to the extreme would not be an exaggeration.
Mirror Flower, Water Moon controlled the five senses?
No. The illusions manifested by Mirror Flower, Water Moon directly became reality, altering the world itself!
Likewise, things that existed in reality could be twisted into illusions by Ultimate Aizen.