I was thinking that there are two the fates calculated by the Heavenly Principles one was imposed to Irminsul would have to be the base fate which doesn't include the Traveller as a Descender and I would call this one Teyvat's Fate.
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The second I would call Celestia's Fate which includes the Traveller in their calculations and I can see a parallel between the functions of Irminsul as a data base and Istaroth mirroring that function for Celestia. We also know that the Shades are aware of the twins presence in Teyvat their awakening as well as their influence. I would like a discussion, insights, agreements or disagreements cheerio everyone.