This was a story that happened several hundred years ago...
In a certain country, there were two brothers.
The elder brother was a general, while the younger was an alchemist. The two walked entirely different paths in life.
The elder brother took pleasure in exterminating enemies on the battlefield, while the younger wore a smile as he toyed with people who could no longer move in his workshop. Thus, although the two had chosen paths with no intersection whatsoever, people often said that the brothers shared the same pair of contemptuous eyes.
Every day, the elder brother brought the enemies captured in war to his younger brother's workshop, providing him with "experimental" materials. No one knew what kind of experiments the younger brother conducted. Only the unceasing wails and nauseating stench of blood constantly lingered around the workshop.
Thousands of people died after being wantonly toyed with by the younger brother inside the workshop.
Men and women, the old and the young alike, were slashed with sharp weapons, burned by fire, dismembered, cut into pieces from head to toe and reassembled; their bodies and organs were replaced with those of others, their internal organs removed and replaced with artificial constructs, their eyeballs implanted into drained tooth marrow, and their bodies soaked in mildly acidic solutions for an entire day as they slowly melted away... All of them were living subjects subjected to various experiments.
Many of their souls had already gone numb from excessive exhaustion, leaving only their bodies capable of reacting to the experiments.
Just as these living corpses and dead flesh were about to be buried beneath the workshop, the two brothers suddenly died.
A group of souls was liberated after enduring prolonged suffering and hatred, transforming into monsters known as Hollows. Seizing the opportunity when the brothers