Kiana Void

In Guns Girl Z, the Herrscher of the Void of the Old World was born when the innocent blind Sirin was infected with its energy, showing her the true disgusting world she believed to be beautiful. Starting the Second Houkai War, Herrscher of the Void almost caused the end of civilization but was sealed with the efforts of Welt and Cecilia Shariac. Years later, Kiana unintentionally merged with the core of the 2nd Herrscher during an invasion of Anti-Entrophy to St. Freya Cathedral under the machinations of Cocolia, becoming the Herrscher of the End and destroying the reality. In the new Honkaiverse, the Herrscher of the Void came to life in the year 2000 D.C. and started the Second Eruption after her host Sirin, one of the guinea pigs of Schicksal's Babylon Tower, awakened her powers as a Herrscher, causing a bloody war between the Houkai and humanity that took the lives of billions. Later, she made a deal with the Houkai God to gain even more power and used her new powers to destroy multiples continents with debris of the moon, killing a large portion of mankind before starting the Armageddon. Within the war, she founded her own army of Houkai and Pseudo-Herrschers. She was killed by the S-Valkyrie Cecilia Shariac during a rain of nuclear missiles but not before taking the whole North Siberia into her void realm, killing millions more before her defeat. Years later after her first defeat she awakened in the body of her own benevolent clone K-423 (Kiana Kaslana) under the manipulation of Otto Apocalypse, and started the 4th Houkai Eruption, pushing all life of the planet to the brink of extinction before she could be sealed once again. She continued to exist inside of K-423 and tried to take over her mind multiple times but the traumatic experiences of her host allowed her to control the Herrscher of the Void's powers, becoming Void Drifter. In the battle against World Serpent, where Kiana had to face one of the many victims of the Herrscher, Raven from World Serpent, Kiana fully learned how to use the Herrscher's powers and gems after saving Ark City from the World Serpent's Houkai energy bomb. In the following chapters, the true Herrscher of the Void is expected to return in 2 months after Kiana absorbed too much Honkai energy from World Serpent's HW bomb to save Ask City, forcing the main heroines to follow different paths to seal the Honkai before Kiana can become the Herrscher of the Void who is returning more powerful than ever before.

It was much later revealed Sirin and Herrscher of the Void are different entities and fully became different entities when Sirin was cloned, becoming K-423 (a clone body of Kiana Kaslana) by Otto Apocalypse and Schicksal's scientists and had her memories erased by the former in 2000, soon after the end of the Second Eruption. It resulted in "Sirin" being actually the true main protagonist of the Honkaiverse's Current Era (the Kiana Kaslana the player uses during course of the game) and the Herrscher of the Void being the primary threat to the heroes while being her former self. She primarily serves the purposes of the The Will of Honkai, to destroy the human civilization the Herrscher of the End failed in destroying after a few human beings who survived the First Apocalypse repopulated the planet again.

Although she is a servant of the overall main antagonist (to the Will of Honkai, aka Honkai God), Herrscher of the Void is the biggest threat faced by the protagonists and the most dangerous and dreadful Herrscher of history for unleashing two Apocalypses upon humankind since Herrscher of the Corruption the 12th Ruler of the Old World who started the Second Apocalypse in 1470 with the Black Death in the New World, making herself the most evil and fearsome Ruler of history and later the Herrscher of the Reason, also known as Welt Joyce who was known as the First Herrscher of humanity and the one who caused the First Impact in Berlin in 1952. Aside from bringing hundreds of millions players to the game thanks to her massive popularity, her character was critically acclaimed for being the ideal female villain. Moreover, her widely villainous role as an extremely powerful, sinister, misanthropic, vile entity and yet beautiful girl who had success in almost all of her genocidal plans while being the very embodiment of the Apocalypse itself, easily made her one of the most influential, complex, popular and iconic female villains in Asian mobile games.