You may have noticed that so far chapters been relatively short. This is because, I'm still in the process of introducing the story. From here on, I'll be able to go into more detail, but not by much. It won't be until much later, that thing become more detailed and adventurish like I'd like it to be.
The name of the original Blood King remains unknown, kept secret by the higher echelons of the Soul Society, but we know that he was once Captain of Zero Division, otherwise known as the Royal Guard. The nameless Blood King sought to marry into a noble family, far above his own class, but was denied by the Spirit Kind and his court. Enraged by this, the Blood King began to tell stories of corruption in the Royal Family, and in Soul Society. He gained followers, and soon, the Shinigami were split between those who remained loyal to the Royal Family, and those who followed the Blood King.
Inevitably, war broke out in Soul Society. The Blood King and his followers planned to assassinate the noble families of Soul Society, and acted quickly. In the early stages of the rebellion, the remaining Zero Division members, along with then 7th Division Captain Kamui Shirokawa, discovered the intent of the Blood King and his followers, and acted to prevent the deaths of as many nobles as possible, saving 4 of the 10 major families that were being targeted. News spread quickly of both the successful and failed assassinations, and Soul Society was put on high alert. The traitors went into hiding, but the blood shed did not stop. Many of the Shinigami, who had not defected to join the Blood King, found that they shared certain ideals with the rebel and his followers. Friends and family warred among themselves, and Soul Society's men were split once again, as more people joined the cause of the Blood King. War started again, but the rebels soon retreated, leaving no traces other than the corpses of the slain. No one could find where they had hidden themselves, and they assumed they had fled to the World of the Living. It was later discovered that, while it was not the World of the Living they had fled to, it was indeed another realm. The rebels, who became known infamously as the Onigami, had created an entirely new realm and there they created an Empire and a town, becoming a complete shadow of the Soul Society.
Months later, the Onigami-the name embraced by the traitors-sent a message to the Shinigami, in the form of a note, carved into the corpse of a 1st Division member, at the door of the Commander General: The Onigami are coming for the head of every Royal … A week later, the Onigami invaded, under the banner of the Blood King. As the war restarted, yet more Shinigami joined the ranks of the Onigami, Captains numbering among the newly turned. The war moved into the other realms, including the Seirei Realm, home of the Onigami. Countless numbers of people died; the tactics and strategy of the Blood King proving too great for the Gotei 13 to handle. They needed more power…power that the Quincy offered.
With a common enemy, the Quincy and the Shinigami joined forces, attacking the Onigami as a single force. The tactics of the spiritual archers proved to be a thorn in the side of the Blood King's forces, and the tide of the war was turned in the favour of Soul Society. Things could not last however. When the upper echelons of Soul Society saw how the methods of the Quincy upset the balance of the world, they ordered that the Quincy be exterminated along with the Onigami. In a battle that would come to be known as "the Battle of Crossing", which took place on a large bridge in Japan, the Shinigami turned on the Quincy, and a war that had once been waged on two sides, was suddenly fought on three.
From here, the formalities of war were all but gone, and nothing but bitter battle waged. At the end of the Battle of Crossing, the Onigami took a large number of Shinigami captive, and decided to use them as a bargaining chip. However, to their surprise, a team of 11th Division members, led by their Captain, Hasaki Ryo, who would one day be known as "the Wildfire", made a charge on the Onigami in an attempt to rescue their comrades. Ryo and his men did major damage to the Onigami forces, but only managed to rescue 40 of the captured Shinigami.
In the after math of the war, the Commander General-then Kuriyami Ryuu-and the Blood King met on neutral ground, and signed the "Non-Aggression Act", formally ending what would henceforth be known to those ware of its existence as "The Great War". It was 25 years before the end of all this blood shed when I was born, and it was nearly 18 years later that I would die. 7 years of war remained when I entered the Soul Society.