(creds to @tillandsias1 on Twitter for the inspo)

I think we can all agree that Caribert was one of the most intense, arcane, whirlwind experiences of this game so far.

One of the biggest unanswered questions from the quest is Caribert’s fate after he removes his mask. The cutscene made it look like a deliberate act of ending his life as he knew it.

But did Caribert really die? As implied from previous quests, the curse inflicted upon the hilichurls is also one of immortality:

Dainsleif: “The curse of ‘immortality’ denies death to [hilichurls]… and yet, it does not truly mean that they will never die.”

As beings cursed with “immortality,” they are naturally denied reincarnation via re-entrance into the ley lines after death. And yet, we see hilichurls “die” constantly—we have to kill a lot of them, unfortunately—and Caribert’s absence implies that he is no longer in this realm.

Note: in this realm, AKA the dominions of human and light. Matter cannot be created nor destroyed, and Teyvat's "laws" seem to establish this also, being that dead people return to the ley lines and new life is reborn from them, though Irminsul tampering may complicate this. In any case, who’s to say that Caribert, when he removed his mask, didn’t return to the void realm? The “anti-ley lines,” if such a thing exists. Chlotar's dialogue immediately after the cutscene was also not suggestive of someone who saw despair/hopelessness in his son's "death," in spite of his curse. In fact, quite the opposite:

Chlotar: "Caribert did not deserve his fate, but now... It's wonderful — he will be able to weave his own destiny anew... Born into abject sorrow, he shall now become... "The Loom of Fate."

(I do want to quickly point out that his use of the term "Loom of Fate" establishes that the concept precedes the foundation of the Abyss Order. Is this something we witnessed Chlotar come up with on the spot? Or perhaps a remnant of Khaenri'ahn belief?)

This is where I want to bring up Neon Genesis Evangelion, a franchise Mihoyo is huge fans of and from which they have drawn inspiration. In NGE, all organic life on Earth is made up of a substance called LCL, which is in fact the "blood" of Lilith, the alien progenitor of humanity. When Third Impact is initiated, all organic life reverts to LCL and accumulates in Lilith's vessel (her "Egg"), and thus begins Human Instrumentality, i.e. to eliminate individuality and combine all souls into one evolved, perfect being.

Basically, I just want to bring up the idea that when Hilichurls "die," they revert into Abyssal LCL and enter the "anti-ley lines," and that the "Loom of Fate" operation is Genshin's take on Third Impact/Human Instrumentality, wherein "dead" Abyssal beings accumulate into an entity that can upend fate itself...

Sorry this is very rambling and that I jumped to conclusions. I really just wanted to elaborate on a crazy idea I had!

EDIT: I also want to posit that the voice in the crystal is the architect of the “Loom of Fate” (perhaps Genshin’s Gendo Ikari), whether this Loom is an actual tangible thing or the operation/ethos generally. Hence why he is the Sinner with a capital S.