AsmoEi

AsmoEi is the femslash ship between the Sustainer of Heavenly Principles and Raiden Ei from the Genshin Impact fandom.

Canon
The two have never interacted. They are both gods of Teyvat. However, the Sustainer, datamined to be named Asmoday, appears to be a god of Celestia. Ei is the Electro Archon and God of Eternity, and is likely supposed to be connected to Celestia due to her Archon status. However, she stopped using her gnosis long before the events of the game and thus has no connection to Celestia. One thing of note is that they have similar views of superiority over mankind; Asmoday looks down on mankind for being arrogant, and Ei went to extreme measures despite what her people thought, because she believed she knew what was best for her people.

Ei's pursuit of eternity has also been connected to Asmoday's domain, the Heavenly Principles. At the end of the Liyue Archon quest, Zhongli explains Ei's reasoning for her actions, quoting: "Seven ideals for seven gods, and of these, Eternity is nearest unto the Heavenly Principles." Similarly, in the Raiden Shogun's character demo, she states: "Only through Eternity are you closest to the Heavenly Principles."

Both gods also seem to be present around the fall of Khaenri'ah. Due to the cubes seen during the Cataclysm, Asmoday is most likely the one to have destroyed Khaenri'ah. Ei arrived in the aftermath and witnessed the death of the sister there. It is unknown if Asmoday or Ei saw each other at this time.

Fanon
AsmoEi is a rarepair in the fandom. Its main appeal is that they are seen as the Genshin version of Honkai's Kiamei. Asmoday is seen as the counterpart to Kiana as the Herrscher of the Void, with a similar design, powers, and the same CN/JP voice actors. Raiden Ei is also a clear counterpart to Raiden Mei, with the same surname, electricity powers, voice actors, among other similarities.

The ship was at it's most popular before the release of Inazuma, where Raiden Ei's lore was unknown. Some theorized that Baal knew Asmoday and her current actions are an effort to reunite with her. People like to play with the idea that the two feel an inexplicable connection to one another, because Kiana and Mei are destined for each other no matter what universe. Alternatively, since Asmoday has an antagonistic role in the story, some portray them as enemies, or an evil power couple.

After the release of Inazuma's Archon Quest, the theorized connection to Ei and Asmoday changed. This theory stipulates that Asmoday, or Celestia in general, is similar to the Honkai, which destroys civilizations once they advance too much. Thus, the reason Ei wanted to maintain eternity and stop change was to prevent Inazuma from being destroyed like Khaenri'ah was. The release of Inazuma also brought the rise of EiSara and EiMiko as Ei's most popular ships, so AsmoEi decreased in popularity. Asmoday also started getting shipped with Raiden Makoto since the two plausibly could have met in Khaenri'ah. This ship allowed people to fulfil their want for an alternate universe Kiamei while still being able to align with canon lore and ship EiMiko alongside it.

Fandom
FAN FICTION

TWITTER
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Trivia

 * The Herrscher of the Void and the Raiden Shogun have the same ability of walking through the air by making circular platforms below their feet. Asmoday displayed a similar ability as well, though her platform was less solid.
 * The Herrscher of the Void's has many lines about inflicting judgement(most notably her ult), and the Raiden Shogun's character demo is named "Judgment of Euthymia."