Houkai

"On this planet. The Honkai grew up with civilization for many millenia. Many timelines. And numerous worlds. As society developed and improved over the course of history, the Houkai grew ever stronger. With the solo purpose of exterminating us."

- Narrator

Houkai or Honkai and also known as Collapse are the titural central antagonists of the mobile games Guns Girl Z, its sequel Honkai Impact 3 and appear in all its different forms of media as major antagonists. They are the central threat to all humanity and appeared in many different worlds to cause the end of all civilizations. The Honkai are like the secondary dominant race of the world and grows with civilization and seeks to destroy it to fulfill God's desires.

The Honkai are not actually physical threats but a supernatural phenomenon that manifests itself in many ways, including infectious diseases, plagues (and even digital viruses), infected humans (zombies), natural disasters (such as sentient tornados, tsunamis etc), Honkai beasts, and its primary form; the Herrschers, humans with superpowers that defy physical laws. The Honkai threat will be the primary adversary for the player (Captain of the battleship Hyperion). Interestingly, Honkai grows and evolves with human civilization and technological progress, and appears to be dedicated to its ultimate goal of destroying humanity by all means necessary. Ironically, the Honkai energy is also extremely useful, and several human organizations have harnessed it to generate massive power.

History
The Houkai have no background and it's speculated the Houkai, or the Will of God, exist since before the creation of the universe. Million years agom the extinction of the dinosaurs in the Cretaceous period happened because of the first outrbreak of Honkai but it's unknown what they showed up before humans could have existed.

Despite being represented as monsters, the Houkai is actually a sentient cyclical natural disaster phenomenon, a rhythm of periodic adjustment of the universe that appear once in a while to start the end of a civilization. Every once in a while, the Houkai will break out in some unknown form, it can be in form of zombies, plagues, digital virus, meteors, tsunamis, earthquakes or even monsters and beasts. 50,000 years ago, when humanity reached the top of its existence, Houkai evolved in the form of Herrschers and caused the eventual destruction of mankind by the hands of the last Herrscher after decades of intense war, Herrscher of the Void, also known as Past Sirin or God Kiana.

When the world was reseted by Sirin, humanity had another chance to fight again the creatures that once caused their extinction. After million years fighting the Houkai, the outbreak time of the Houkai was considered irregular and difficult to predict the Shicksal organization was founded thousand years ago to prevent disasters like the Black Death, started by the Herrscher of the Erosion from happening again.

Overview
The manifestations of Houkai are unpredictable and impossible to describe by normal means. Some say even humanity's sins are related to Honkai energy; it can be wars, infectious diseases, climate disasters, comet impacts, and even the arrival of giant monsters are all possible. By all means, any disaster can be considered a Honkai doing in noncorporal existence.

According to the interpretation of Shicksal studies, the Houkai is the unpredictable will of God, the creator of universe who often uses their will to destroy worlds he is not sastified with. But from the results, it bring about a large number of extinctions of the world's dominant species. In forms of monsters, the Honkai have no specific targets and desires to destroy and kill everything it sees in its path.

Energy
Houkai releases a kind of energy that has never been seen in the past technology, it's called "Houkai Energy", an energy that can be used in infinite methods, including in the creation of technology such as robots, ships, super-weapons and vehicles. The efficiency of Houkai can far exceed any energy available in the world, but if a living being is exposed to this kind of energy they will become zombies of monsters.

In rare cases, there are people who can endure the Honkai energy and become a Herrscher if it chooses them as humanity's Harbinger of Doom. If it the energy rejects them, they will become mindless and weak zombies with no persona and will. When Houkai energy in an area reaches 1000 HW (Houkai Watts) or higher, there is a small chance that someone may absorb sufficient Houkai energy to become a Herrscher.

Trivia

 * Honkai are said to be the will of God, also known as Honkai God. In the world of Honkai Impact 3, the said God is God Kiana, the past Herrscher of the Void of the old world. It's unknown who was the God of the Old World before Sirin could have become a Herrscher.
 * It's said in-universe Honkai exists in all planets of the universe and destroy civilizations once they have reached the top of their evolution to create a new world with a new civilization. However, it's unknown if they truly appear in other planets.