Authors POV: These short snippets are events that take place in the seven years between the previous chapter and the next.
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On two separate occasions, Dottore dosed the rest of the male harbingers with a ridiculously strong laxative and locked the doors to the lavatories as a joke. He sat there laughing hysterically in his lab while the 1st, 4th, 5th, 9th, and 11th harbingers were trying to get to the toilets before shitting themselves only to realise the doors were locked and eventually soiling themselves, much to the chagrin of Kaeya who could have stopped this. When Dottore tried to do it again a couple of years later, Kaeya found the spare keys to the lavatories and unlocked them for each and every one of the affected harbingers, successfully thwarting Dottore's prank.
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In a sparring match with Childe, under the supervision of two of the best fighters in the Fatui, Il Capitano and Il Dottore, Kaeya achieved a transformation when Childe decided to go all out and use his foul legacy transformation. There was a clash of blades as Kaeya one-handed his claymore to collide with Childe's dual ended spear. From the cloud of dust that formed, a supernatural blue and silver chilling mist flowed from the grey cloud. Once the dust disapated, the figure producing the mist came into view, a 13ft tall monster that was resting a giant wavy sword over its shoulder. This monster looked like an Abyss Lector, but instead of purple or orange, he was uniquely blue and silver like...Kaeya.
"Kaeya?" The cyclopian warrior (Foul Legacy Childe) said through his mask.
The figure glanced at him, then immediately after launched an enormous Abyssal Ice attack by stabbing his sword into the ground and dragging it up through the ground in a crescent slash.
Childe only just managed to dodge before his foul legacy transformation ran out and collapsed in front of the two supervising Harbingers. The abyssal mutation that Kaeya had utilised was like Childe's foul legacy but had no drawback to it. The icy cloak flowed in the snowy wind as the creature floated towards the three other harbingers inches above the ground. It then proceeded to kneel down and start to heal Childe's injuries from the match.
"Kaeya, can you understand me?" Dottore said in the old language of Khaenri'ah as he was fluent in it and knew abyss monsters speak in that language from his research.
The monster opened its slit like mouth under the Heron shaped mask it was wearing, revealing sharp pointed teeth and said two words in the standard language of Teyvat. "Yes, Zandik."
The doctor was shocked that his 'nephew' was talking to him in standard as an abyssal creature.
Kaeya detransformed a minute later, alongside his sword, and passed out on top of Childe.--------------------------------------------------------------
A year after the Abyss monster Kaeya incident, an Abyss Mage managed to sneak onto the premises of the Fatui Headquarters to steal Dottore's research, only to run into an Abyss Lord, a transformed Kaeya who was floating (much like an Abyss mage or Lector) around the Headquarters to clear his head.
"My lord!" The abyss mage said, bowing on the ground to Kaeya, who looked at it with a look of confusion and then disdain for what has become of his people.
Kaeya followed the Abyss Mage to one of Dottore's Record rooms (he has 3). The Abyss mage was looking for research on the Archons and their weaknesses. As soon as the mage had found the research files, Kaeya promptly drew his claymore and impaled the Abyss Mage before its shield could form, killing it instantly. Blackened blood spills from the wound as Kaeya pulls the sword from the abyss mage's chest. He then dragged its corpse to Dottore's lab for research purposes. Needless to say, Dottore was pleased to have more research material.--------------------------------------------------------------
2 years before Crepus' death and Diluc's subsequent massacre of fatui. Kaeya is biologically 20.
The Jester, Doctor, Damselette, Captain, and Successor enter a room swirling with abyssal energy. At a table that manifested from the darkness, a young woman about 16 years old in appearance, wearing a white and blue dress and possessing golden eyes and blonde hair, sits before the 5 people that could take on a god in single combat.
"So, you believe that the Fatui and the Abyss Order can come to an agreement and forge an alliance between the two factions." The girl said, crossing her arms on the table.
The sounds of bones breaking, rapidly growing, and re-fusing could be heard echoing off the swirling walls as the concentration of abyssal energy forced Kaeya to undergo his transformation. Pierro and Columbina turned around to see a figure more than twice the height of either of them in shock. The blonde girl's eyes widened as well from witnessing a new abyssal mutation.
"Of course, Capitano and Dottore didn't tell you two about this." Kaeya says in a crackling voice, facepalming to the best of his ability, due to his mask.
"So the Crown Prince of Khaenri'ah is now a member of the Fatui." The Abyss Princess says arrogantly."News flash, 'Princess', I have been a part of the Fatui since its founding 500 years ago. Usurper. " Kaeya said, anger blazing, his cryo powers causing several large spikes to form on his back, which emanated a silver and blue fog. This was followed by a pacing rant in Khaenri'ahn filled with old Khaenri'ahn explicitives.
"Why did you have to piss off one of the most dangerous things in the room at the moment?" Dottore said, exasperated to the Abyss Princess, calming Kaeya down
"Come to think of it, a year ago one of my pyro Abyss mages went missing on a mission and never showed up again. It was last seen in Snezhnaya, near your headquarters." Lumine said inquisitively.
"Oh, that little guy who bowed to me and said 'my lord', he was rummaging through Dottore's Archon research, then someone or something killed him in a single blow." The Abyss Lord said, bobbing up and down levitating, trying to disguise the fact that he ruthlessly killed that mage.
"We want the same thing, Lumine, the destruction of the Sustainer of Heavenly Principles. She is the one who did this to us." Pierro says, trying to negotiate with her
"I wish to make the gods suffer." Lumine says coldly
"You do realise that your plan would destroy teyvat and kill thousands from your precious order as well as the Crown Prince and the High Mage." Kaeya, Dottore, and Pierro exclaimed in unison. "ALL OF YOUR PROGRESS GONE" Columbina, the most level-headed and calm member of the harbingers, yelled into the preceding sentence.
Getting nowhere with her just yet, the harbingers decide to leave through a portal that Kaeya had made. Pierro went to play a game of chess with Pulcinella, Columbina went and took Arlecchino on a night out, Dottore decided to spend the rest of the day with his husband, Pantalone, and Kaeya who went to Dragonspine through his portals and brought Albedo to Snezhnaya for a short time, almost as if they were on a date.

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The Displaced (A Fatui Kaeya AU)
FantasyA humorous, serious and adventurous story involving Kaeya after the cataclysm. he is adopted by the Ragnvindr family but runs away after having his eyepatch ripped from his face and being called a freak. After two months, he finds his way to Snezhna...