Kami is the first ninja in 200 years to break through the ancient, forbidden path. He defied his clan and his mentors, and abandoned the balance and creed that bound him all his life. Doom now powers those who embrace the mystery of the shadows and slaughters those who conform to the rules.

Zai is an orphan who was adopted and trained by a great ninja master. In his mind, there is only one person who can match him, and he is the son of the master, Shen. It seems that he will never be favored by his mentor, as every fight he has with his opponents has ended in a draw.

Driven by frustration and jealousy, he begins to look for a way to win. The young ninja ventures into the forbidden place of the clan temple and finds an ominous box decorated with sumpnment.

After sensing the dark mystery in the box, Zai knew he shouldn't open it, but despite that, he snooped on it. In an instant, the shadow touched his mind and displayed the forbidden ninjutsu that had been hidden for a long time.

With this secret weapon, he challenged Shen again, and this time he won. At this moment of victory, he expected approval and recognition, but for some reason, the Guru knew that he had used the forbidden technique and expelled him.

He wandered in humiliation for years. He turned suffering into determination and began to train others with the shadow genre. His power grows, as do his followers, but he knows that without that ominous box, his ninjutsu will never be perfect.

One day, he examines his followers and notices that his disciples are now a formidable force. So he led them back to the temple and asked for the box.

At the gate, he was amazed to find the old mentor waiting, and receiving him and his disciples as if they were honored guests. The old man placed his sword at the feet of the robbery and claimed that he was a failed mentor.

Because as a mentor, he was not able to bring his former apprentice back to the path of equilibrium, but instead exiled the calamity, forcing the calamity to escape into the shadows.

The old Mentor begged for him to enter the temple, destroy the box, and lead his followers back to balance. So the Dark Ninja walked into the temple with the Mentor. Moments later, the ninjas who had already assembled heard a cry of pain from the Emperor.

Inexplicably, he appeared unharmed and threw the head of the mentor at Shen's feet. With a furious scream, Zai ordered his men to slaughter the Mentor's apprentices and seize the Ominous Box. On that day, the Old Ninja Order was destroyed.

Although many of the apprentices died, under Shen's heroic resistance, there were also a group of apprentices who were able to escape. Today, the temple has become a training ground for the Shadow Order. Zai is the master of the Order, and his decree is simple: perfect your ninjutsu and kill all ninjas who refuse to embrace the shadow.

Siddhar Cain is an elite practitioner of shadow magic, and the purpose of his battle is to realize his true destiny, so that he can one day lead the Shadow Stream Sect and usher in a new generation of Ionian hegemony.

Cain wielded the living Darkspawn weapon Raast with great care, unconcerned about the corruption it inflicted on his body and mind.

There are only two possible consequences: either Cain bends the weapon to his will; Or, the vicious blade will consume him completely, setting the prelude to the destruction of Runeterra.

Born in Noxus, Cain and other children of the same fate were forcibly recruited into the army as child soldiers. Only the most insidious Noxian commander would resort to such brutal means.

Because Ionian compassion is a weakness that can be exploited, their warriors will hesitate to strike when faced with seemingly innocent opponents. Therefore, Kai Yin, who could barely hold the sword, was sent to the battlefield, which was also equivalent to going to the execution ground.

This Noxian force landed at the mouth of the Yipo River. Cain and the other child soldiers were forced to act as a vanguard against a group of local militias that had been improvised to defend their homes against the resurgence of invaders.

Kaiyin's little comrades-in-arms fell or fled, but Kaiyin was undaunted. He threw away his heavy sword, picked up a short-handled scythe from the ground, and turned to face the surprised Ionians, who happened to be whistling from the flanks of the regular Noxian army.

The sights of the slaughter are horrifying. Farmers, hunters, and even a few Vastayas were slaughtered without dignity.

Two days later, word had spread throughout the southern region of Ionia, and the Shadowstream Cult had arrived in the Killing Grounds. He knew that this area was of no tactical value at all. The massacre was only to send a message: Noxus will show no mercy.

A cold light fell into the corner of his eye. A child no more than ten years old was lying in the mud, gesturing at the Master Assassin with a broken scythe. His hand holding the hilt of the knife was bloodied, and his complexion was pale.

The boy's eyes contained pain beyond his years, and at the same time burned with the anger of a veteran. This kind of indomitability cannot be learned at all.

The child, the survivor abandoned by Noxus, opened his eyes to a potential weapon that could be used against those who sent him to his death. He reached out to him and took Kai Yin as a disciple of the Shadow Stream Sect.

Traditionally, disciples are required to choose a weapon and train for years, but Kai Yin is proficient in all weapons, and for him, the sword is just a tool, and he himself is the real weapon.

In his eyes, armor is a cumbersome burden, so he only wears a shadow, and the light and swift invisibly kills people. With his swift killings, those who escaped could no longer escape the grip of fear.

As Cain grew to fame, his ego began to swell. He firmly believed that his figure would one day be able to cover the sky and even surpass the Grandmaster Tribulation.

His megalomania led him to take on his final test: to track down the Darkspawn weapon that had recently been unearthed in Noxus and stop it from posing a threat to the struggling Ionian defenses.

He accepted the trial without hesitation, but never asked why he had been chosen for the task. It was true that any other disciple would have completely destroyed the living scythe named Rayast, but Cain kept it for himself.

The moment his five fingers grasped the long handle of the scythe, the corruption immediately began to invade his body. He was locked in a fateful struggle with the weapon.

For a long time, Rayas had been waiting for the perfect host to reunite with her fellow Darkspawn and destroy the world. But Cain was not easily devoured. He returned to Ionia as a victor, convinced that he would be appointed the new leader of the Shadowstream Cult.