Herrscher of the Corruption

"You should be thanking for making the foolish delusions of the villagers become reality! To be devoured by a God you love and believe in, isn't that a blessing?!"

- Erosion to Kallen.

"What I am going to do now? Destroy everything that you want to protect."

- Herrscher of the Erosion about to slaughter Yae's village.

"Unforgivable! You opposed me all this time, but what can you do with the mere strength of a human? Let me say it once more! You are powerless before me! Watch closely and despair! You shall never be reunited with this girl again!"

- Herrscher of the Erosion before devouring Yae Sakura.

Herrscher of the Erosion, also known as 12th Herrscher, Ruler of the Erosion, 12th Ruler or self-called as Yakujin or God of Disaster is a major antagonist of the popular 2018 manga Guns Girl School Dayz, a side-story of the iOS/Android game Guns Girl Z and Honkai Impact 3. They are introduced as the main antagonist of the said comic books, the central antagonist of Honkai Impact 3rd - The Secret of God Keys and Honkai Impact 3rd - Gratitude Arc. Due to its machinations in the past and starting the Second Apocalypse, it's considered to be one of the most important antagonists of the franchise.

12th Herrscher had the ability to project her own consciousness onto any object and control it freely. In reality, this Herrscher was actually a self-aware lethal virus which was coloured black, which infected everybody and turned all life forms into zombies. Not only that, but she was also able to control machines, launching nuclear missiles and destroyed a part of the old world. Professor Mei had to seal it into the purple box before it managed to destroy the rest of human civilization. 49,000 years later after God Kiana reseted the world, it was still sealed inside of the Purple Box until it fell into Schicksal's hand, causing the Black Death in Europe during the Medieval Era. After witnessing the inhumane experimentation of Schicksal using Crystal Disillusionment, Kallen stole the purple box and ran away to Yae Village and later got fatally wounded. Yae Sakura later unwittingly opened the box, releasing Higyokumaru and all her stored hate all over the past time and possessed Sakura, turning her into a large fox beast that was later defeated and sealed by Kallen.

In-game, the Nine-Tailed Fox shows up as a boss in the Simulation World.

Guns Girl Z - Old World
Herrscher of the Erosion, or also known as the 12th Herrscher, was a sentient self-aware virus that was fused with Honkai energy and gained free will to act and think by itself, which infected humans and animals and turned them into zombies. After it gained freedom to think the disease quickly considered itself to be superior and saw all humans as food and its plaything. The virus then infected a little innocent girl and used her as a host to spread one of mankind's most deadly plagues that killed 90,000,000 people in a few months. When the innocent girl was discovered to be the host of the disease, the now Herrscher of the Erosion used its energy to bring the army straight to her, resulting in the innocent girl being tortured by scientists to discover a cure for the plague and then executed in cold-blood.

Once its host was destroyed, the Herrscher quickly left her body and infected all civilians in the North Asia, turning half of China's population into zombies and hacked into America and Asia's nuclear bases, launching nuclear missiles and destroying half of the world, killing billions more just to create its own Plague Kingdom. Professor Mei then sealed the disease inside of a Purple Box, where it would be kept sealed for 49,500 years.

Honkai Impact 3 - New World
49,500 years later after God Kiana/Sirin reseted the world, the Herrscher of the Erosion continued locked inside of the Purple Box until one day in 1490, the organization Shicksal found the box and began to experiment on it. Once it was free, Herrscher of the Erosion evolved and infected half of Europe with the Bubonic plague, starting the Black Death and the Second Apocalypse, wiping out 1/3 of the world's population. When the main heroine discovered her lover, Otto Apocalypse (who was still a good guy back then and became the story's Big Bad thanks to Herrscher of the Erosion), was perfoming human experiments to fix Herrscher's cruelty, she stole the Purple Box and fled from Europe and went Asia.

In Asia, when the main heroine is rescued by the innocent Yae Sakura, Herrscher proceeds to self-call itself as Yakujin, God of Disaster and infects Yae's body, controlling her and her emotions. As the years passed, Herrscher cursed the village with plagues and scarcity of food and water, leading the villagers to adopt cruel methods to save their village; sacrificing children to the Gods. Inside of her body, Herrscher forced her to kill children in sacrificial rituals that were supposedly to be sacrifices to "please the Gods" when in fact it was only giving more power to Herrscher of the Erosion.

One night, Herrscher of the Erosion takes over Yae's body and kidnaps a young girl from the village. In the forest, it tied the girl in a tree and killed a bear that was just passing by before turning the animal into a Honkai creature and gave the defenseless girl to the Honkai to be devoured alive. One day later, Herrscher dispatches the creature to attack the village, killing dozens of men, women and children to force the villagers to sacrifice even more children for their safety. When the ritual was interrupted by Kallen who considered their ceremony heartless, Herrscher transformed itself into a giant ghost fox and devoured the child before crushing her mother with its paws. When Kallen asked the creature why it was doing all of it (to Yae who was being controlled by the Honkai), Herrscher simply said villagers should be thankful for being devoured by a God and then states it's going to destroy everything Yae and Kallen loves the most, making its way towards the village to kill the rest of the villagers. After devouring and killing all the villagers, Herrscher burned the village to the ground. After a long fight, Herrscher of the Erosion defeats Kallen and forces Yae (who is currently watching inside of her subconscious) to watch it killing her lover but Yae breaks out of its mind control and commits suicide to prevent herself from killing her loved one. Herrscher returns to its Fox monster form and devours Sakura right in front of Kallen to show how much she is powerless before a "God". It then fights Kallen and is sealed for more 500 years.

500 years later, Yae Sakura was revived and found by Kiana and then has a fight with Kiana group. With her revival, Herrscher of the Erosion also came to life and tries to invade Yae's body again, slices Raiden Mei's back in front of her friends to show the meaning of despair, and stating its desires never changed even after 500 years; its desires to create a Plague Kingdom.