Aizen nodded. "That's right... the Ryūtōji Family! The ancestors of that family were the first to create Kido, so the entire family specialized in Kido! One member of the Ryūtōji Family researched a special kind of Kido and entered Zero Division! But after entering Zero Division, for some unknown reason, he actually chose to defect!
After defecting, he was hunted down! However, that fellow ultimately escaped Zero Division's pursuit, though he was severely injured! Then he died in some unknown, hidden place!
I remember that when I was still young, I accidentally discovered that hidden place and found what the defector had left behind! A notebook recording Kido, along with some introductions to the Soul King Palace! Most importantly, there was a gemstone. That thing had been taken from the Soul King by a member of the Ryūtōji Family!"
Hearing that, Ren did not pay much attention to it and merely said, "Taken from the Soul King? Wouldn't that just be a Soul King Fragment? It's nothing special!"
Wasn't the Soul King's body made up of Soul King Fragments? Ren was somewhat disappointed. He had thought Aizen was going to mention something extraordinary!
Aizen shook his head. "If it were merely an ordinary Soul King Fragment, I wouldn't have brought it up! The Soul King had crystallized and remained in the Soul King Palace for countless years, as though his entire body had undergone a transformation! His right hand represented 'stillness,' while his left hand governed 'advance.' It seemed to represent time, the time of the entire world, or perhaps the world's advance and stillness!
According to my speculation, after the Soul King died, his body gradually merged with the world and became the World Source! Thus, the Soul King at that time was fundamentally different from the Soul King