Kuchiki Byakuya's household staff weren't even Seated Officers. They were merely as strong as ordinary Soul Reapers.
Caught off guard when their own Zanpakuto suddenly attacked them, they screamed and lost the ability to fight, collapsing into pools of blood that slowly spread beneath them.
Since everything had happened so suddenly, no one present except Byakuya Kuchiki and Yoruichi Shihouin had reacted in time.
Byakuya slowly walked toward Gilgamesh. As he did, he said, "Gilgamesh, of everyone I've met, heard of, or know, you have the greatest talent. Without exception."
"In just two days, you managed to nurture and evolve an Asauchi into your own Zanpakuto. Nothing like this has ever happened before. You've opened a new chapter in history."
He said "again" because Gilgamesh had already made history with his talent for Kido during the aptitude test.
Byakuya's cool voice rang clearly through the Hakuda Classroom, reaching everyone else present.
Only then did the remaining members of the Kuchiki household staff, Renji Abarai, and Rukia notice that the sword in Gilgamesh's hand wasn't an Asauchi but a Zanpakuto.
Asauchi were uniform and simple, with no handguard.
Zanpakuto, on the other hand, each had a unique shape that reflected their wielder.
Renji and Rukia clearly remembered that they had received their Asauchi at the same time as Gilgamesh.
At first, they had assumed Gilgamesh already owned a Zanpakuto. After all, he was so powerful.
But the day they received their Asauchi, they learned that Gilgamesh didn't have one.
In other words, Gilgamesh had started nurturing his Asauchi on the very same day they had.
According to Sosuke Aizen's lesson on Asauchi, nurturing one until it evolved into a Zanpakuto took at least a year.
And that was already a genius-level pace.
So what kind of speed was Gilgamesh moving at?