Khorne was not like most zanpakuto spirits. Because Ren remembered Khorne from Lawrence's life. Not from Bleach but from another universe. Another thing he was a casual fan of. Warhammer 40K!
Khorne was one of the 4 chaos gods who represented blood, war, and murder. His domain covers the most basic and brutal of sentient emotions and actions, such as hate, anger, rage, war, and killing. He was not just the god of mindless violence though. He was also the god of martial prowess and honor. Thus, many prayed to Khorne before battle.
Of the 4 chaos gods, Khorne was the oldest and most powerful. He had come into existence before the others were even thought about. He had seen their birth and what each represented. And he hated it all.
Even though he hated all 3, he hated two of them especially. The tricker god, Tzeentch and the pleasure god, Slaanesh.
Tzeentch because he was a magic user and expert one at that as well as his use of subterfuge. Khorne hated most magic with a passion and preferred to take his enemies on head-on and let the winner be decided by martial prowess and not intelligence.
Slaanesh because he was his polar opposite. Slaanesh represented inner growth and pleasure while Khorne wanted outer strength and ability. Slaanesh, let his followers experience life to its fullest while Khorne wanted his followers to die willingly for his cause.
This is the official reason that most were told. But insiders such as the other chaos gods and their champions knew there was another reason.
Slaanesh had killed one of Khorne's most loyal and devoted followers when she rejected his advances. Khorne would eventually bring her back to life and marry her but the debt of blood must be paid.
As for the Khorne that was his zanpakuto spirit, it was very similar to the original god. It had a very similar look and personality. Ren was unsure if his soul as Lawrence corrupted or changed the original spirit but once it fully awakened, he was shocked by who he saw instead of some spirit or fae.
Khorne was a being that demanded blood and skulls. It said that the ones of shinigami and hollows were far better than any of the beings it had tasted before.
It was like a quincy though. Khorne would take souls out of the reincarnation cycle where they would be consumed by him. This was the only reason why Ren went out on missions at all, to keep Khorne satisfied.
But Khorne cared not just about eating souls, using blood to fill his rivers, and skulls to raise his throne. He was also very picky about other things. Such as when Ren used kido.
Recognizing it as magic, Khorne would throw a fit and may not even allow Ren to use his shikai if he used too many kido spells. Ren believed this was due to Khorne's dislike of Tzeentch in his past life or true self. Whatever the reason, the pair agreed on 10 kido spells per year.
Ren also had to train like hell. It turned out that the original reason that Khorne did not awaken was not due to the amount of blood he was being fed but instead because of Ren's low level in all 3 of his combat skills (Khorne ignored kido). All 3 had to be at the practitioner level before Khorne would awaken.
Khorne had been nagging Ren for years to leave the division and find more opponents so he could fill his rivers with more blood and have his skull raised higher. Ren did not understand what was going through Khorne's mind but he did not care too much.
He was growing bored of his repetitive lifestyle so did not mind leaving the 10th division. He was just waiting for the right time. And they had definitely provided it.
So Ren packed up his few belongings, collected his bonus, his recommendation letter, and left the place he had called home for the past 100 years behind.
He had to travel around Seireitei in order to reach the 11th division. They were located on the outer edge of it and located in the east while the 10th division was in the west. He did not mind the walk. He had barely had any time to relax in past few years since Khorne had forced him to reach the expert grade in all of the combat forms.
As he was walking through the streets, he took in the view of the various people walking around: the nobles shopping, academy students hurrying around, and shinigami taking breaks. It was truly looking peaceful.
Just as Ren had left the busy market district he was just in, he ran into 3 familiar faces that almost crashed into him. All of them were wearing the academy uniform with the girl in red hakama and the guys in blue.
One of the males was a man with tanned skin who had a mustache on his face and glasses. The other male was a young man who had blonde hair and dark circles under his eyes. The last was a young black woman with purple hair in a ponytail.
'Wow. These must have been super old because I'm pretty sure the plot does not start any time soon.'