Last time I talked about how Rhinedottir's Khemia will likely be a thing Albedo figures out only to turn into an angel-styled boss wielding the Celestial element of Light.
But that's not really the only thing she ended up doing is it? We already know all the damage she's caused. What if everything was just for the sake of her alchemy?
So far we've linked her big attack on the rest of Teyvat with her and Khaenri'ah in general having an extreme bias against gods. Dainsleif still embodies that discrimination even after turning his back on the survivors that formed the Abyss Order. But what if that wasn't even really the point? What if Rhinedottir was just jealous that there was something at a power level she couldn't reach so she sought out a way to get to it? Khemia.
Let's relate the steps of alchemy's Magnum Opus to Genshin so far.
We've got Nigredo the black phase. The point of this phase is to rot away the physical to allow the spiritual light to shine through. What did Rhinedottir do 500 years ago? She sent out Durin the poison dragon with its poison blood which to this day has corrupted Dragonspine. She chucked an "iron meteorite" behind Liyue's forces at Guyun so they could attack from the Chasm and now the Chasm is polluted with Dark Mud. She sent Rifthounds and other monsters that accumulated filth across Inazuma to the extent that Makoto had to turn herself into the Sacred Sakura Ley Line Tree to bolster the existing Ley Lines so Inazuma wouldn't be totally destroyed. I'd call that a nigredo step wouldn't you?
She then failed to get to albedo the first time and had Durin eat it but then she managed to get to Albedo. Albedo worked with her after that up until Rhinedottir finds the Heart of Naberius and then has Albedo continue on for her. His own methodologies are questionable. He realizes that Festering Desire is a sword made with pieces of Durin and is cursed to want to cause more harm. Anybody without a strong enough will like himself and the Traveler will be possessed by it and attack. And he tells us to go ahead and power it up for his research. At the end he then says that he realizes one day he might lose control and attack Mondstadt.
Finally because of what this game seems to be leading to I theorized that he will in fact lose control one day because he'll enter the Citrinitas phase discovering something in Khemia but not going deep enough so he arrives at the Light Element without being able to control its will since it would be the will of Celestia.
In the end I think that was Rhinedottir's goal to begin with only neither she nor Albedo realizes how dangerous it is. The point is just to get that same power the gods have since she's jealous of them. Meanwhile in my other theory just using Khemia in the first place might have torn a hole in reality in this case the reality that is the Imaginary Tree and allowed the Sea of Quanta to seep in with its Void power the total antithesis of creation. Now that it's entered Teyvat it is the thing powering the Abyss Order and using them to pivot the Genshin universe back towards its side so it can destroy another of the tree's leaves just like it's already doing with Honkai.
Thanks Rhinedottir! 
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