Kaslana Sisters

Kaslana Sisters are the family ship between Kiana Kaslana, Sirin, and Durandal from the Honkai fandom.

Canon
Following Sirin's defeat and death after the Second Eruption, Otto Apocalypse made a clone of Kiana Kaslana that included Sirin's DNA and Herrscher core, creating Subject K-423. Kiana, along with her father Siegfried, attempted to rescue the clone. Kiana was excited at the prospect of having her as a little sister. However, as they were escaping, Kiana was lost and presumed dead by Siegfried. Otto captured the original Kiana and erased her memories, and once she woke up, she chose to name herself Bianka Ataegina.

Sirin and Kiana
Sirin remained dormant as the Herrscher of the Void persona in the consciousness of K-423, now named Kiana. However, when Kiana was eleven, Sirin briefly awakened and cut off Siegfried's arm. She also briefly awakened in Moon Shadow and was stopped by Fu Hua.

In Chapter 2 of the main story, Sirin started haunting Kiana's dreams. Kiana is angry at this unknown voice at first, but is then compelled when she taunts Kiana with knowledge about her parents' past in the Second Eruption.

In Chapter 7, Otto fully awakens Sirin, resulting in the Herrscher of the Void destroying much of Schicksal in her desire for revenge upon humanity. Himeko saves Kiana from Sirin’s control, dying in the process. Kiana then lives as a fugitive in Arc City, with Fu Hua’s sentience doing her best to repress Sirin. Sirin taunted Kiana, who had to deal with the truth of why she was created and guilt of Himeko’s death. However, Kiana eventually learns to utilize her Void powers without Sirin taking control.

In Chapter 24, Kiana has dreams of Sirin’s memories, giving her a new perspective on Sirin's more human side.

In the Theatre of Domination, The Herrscher of Dominion’s puppets awaken Sirin again, and she proclaims that she will have Kiana submit to her and take over the vessel. Kiana argues that she and the Herrscher of the Void are both born from the original Sirin; Kiana represents her warm wishes of being in a loving family with Cecilia, while the Herrscher of the Void is born from Sirin’s resentment and want for revenge against humanity. The Herrscher refutes that this doesn’t matter, as she will accomplish her goal regardless, and that the Herrscher cores respond to her. Kiana responds that she was actually rejecting the Herrscher cores because she didn’t want to face the past, but now she is ready.

Kiana and Sirin then go through memories, such as K-423 in a cloning vat or Sirin’s first awakening seven years ago. The Herrscher of the Void looks at these moments pessimistically, trying to get Kiana to lose hope. However, Kiana notes that these events show how other people like her father loved her, and shaped her to be human. The Herrscher of the Void then conjures up the memory of the Battle of Schicksal. She proclaims that she killed Himeko, and that both saved and cursed Kiana.

The Herrscher of the Void then uses the memories of the Gem of Haste to argue that all kindness is the world is tarnished by evil, and it’s not worth fighting for humanity. Kiana argues that hope is worth fighting for, and everyone is deserving of a chance to fight for it. The two agree that there is no compromising between them, and that whoever wins the battle will be able to live on in the body. In the midst of the fight, Sirin takes away Kiana’s Herrscher powers. However, Kiana perseveres thinking of the love of her friends and Himeko and takes control of the Gem of Haste. She defeats Sirin, and the power of the Herrscher’s core and gems flow to Kiana. Sirin claims that her burdens and blood on her hands are now Kiana’s, and her soul vanishes.

Quotes
"You and me, we’re two sides of the same coin, two egos born of Sirin’s deepest wishes. You and me - we’re both extensions of Sirin."

- Kiana to the Herrscher of the Void, Chapter 25.

"I will not acknowledge your way of thinking. However, as the victor, you may follow your path. What say you? Struggle to the very end, Kiana."

- Sirin’s farewell to Kiana, Chapter 25.

Fanon
Sirin and Kiana are a popular relationship in the fandom. The writing of their struggle throughout the first part of the story, and how Kiana is a reincarnation of Sirin, is praised by the fandom. Many like to headcanon alternate universes with them as siblings, because of their connection in the story and because both view Cecilia as a mother.

Durandal became added to this sibling duo when it was revealed that she was the original Kiana. Her and Kiana’s sibling dynamic is also popular within the fandom. Sirin is often headcanoned as the oldest sibling and Kiana the youngest.

Fandom

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Trivia

 * In Guns Girl Z, Kiana is not a clone, and she fused with Sirin to become the Herrscher of the End.

Variations

 * Kiana Sisters is the family ship between Kiana and Durandal