What is ArunRos and why do we need to know about them, a long #kaeluc centric thread.

I will go through the hints in-game via several pieces of lore that tell the stories of Arundolyn and Rostam.
1st of all. Summary:

Arundolyn was Grandmaster of the Favonius Knights, successor of Vennessa after she ascended. He was a bright & extremely talented leader, able to wield both a claymore & longsword at the same time, w/o a Vision. (1/2)
Arundolyn was granted the title Lion of Light after Vennessa’s Lionfang Knight title. He also loved drinking & often poked fun at Rostam for disliking it. (2/2)
Rostam. Rostam was Arundolyn’s rival, childhood playmate, best friend & assistant in the Knights. He was granted the title Wolf Pup (probably after Boreas’ title), & stayed alongside Arun since childhood. (1/4)
Aside from Knighthood, Rostam also was said to have inherited Kreuzlied's secret society, an organization that he used to perform dirty tasks ‘unfitting’ for a knight, to protect Mondstadt. (2/4)
Rostam hated alcohol, his canteen only had water. He was the origin of the Favonius Sword, both bladework and smithing. (3/ 4)
During an expedition to defeat the monsters born from Khaenri’ah’s fall, Rostam lost his life. Arundolyn left his position and retired ever since, mourning his death. (4/4)
Arundolyn’s story written in the Brave Heart artifact set
Likewise, Rostam’ POV in Defender’ Will
Their respective weapon of choice: The Ferrous Shadow and Favonius Sword. I don’t own the sword, so here is the wiki page
https://genshin-impact.fandom.com/wiki/Favonius_Sword
What does all this have to do with kaeluc anyway? Several things actually:
1. The phrase ‘uncrowned king’ related to Mondstadt has been used for both Arun & Diluc, aside from both of them holding a crucial position in the Knights.
2. Arundolyn loved alcohol, Rostam hated it. Kaeya loves alcohol, Diluc hates it. Likewise, Arundolyn was bright and outgoing, Rostam was cold and gloomy.
3. Dainsleif, in Diluc’s tutorial video narration, said ‘should the cataclysm from 500 years ago happen again’, while Kaeya’s narration said ‘should he find out the truth’.
4. Kaeya’s first in-game trial was at the Temple of the Wolf. Diluc’s was at the Temple of the Lion (Darknight Hero’s Alibi quest)
5. ‘Arun’ means ‘dawn’ in Hindi. ‘Diluculum’ means ‘dawn’ in Larin. (Btw, ‘crepusculum’ means ‘twilight’)
Rostam likely was taken from a real-life Persian hero, who
 was killed by his step-brother.
All this is to say Diluc and Kaeya are very likely to be reincarnations of Arundolyn and Rostam, with their personalities slightly swapped. (Not hinted at any deaths whatsoever that’s just the fans being maso)
Now that you’ve made it here, Please read these too they’re absolutely amazing:
1. https://twitter.com/xiaokaeluc/status/1332818325861228547
2. https://twitter.com/frozendxwn/status/1336550022301757441
You can follow @hearthofsin.
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