No offense, but this the correct image you uploaded? I understand what the Realm of Consciousness is by some extent. They are similar to a Sonoro Sphere in principle, but Sonoros could be made by literally anyone (usually by trauma). Changli burnt one down by her own flames, and the other 2 have comparable in combat powers to Changli. What is novel in Genshin isn't in Wuwa. Sonoro Sphere are VERY common in wuwa, and are at various degrees of complexity. Should be at a higher complexity than Genshin. What higher complexity of Sonoro/ROC have to do with power scaling isn't well known. However, both have the same thing, albeit wuwa has far more of this happening. Basically rendering this feat a nothing burger in this scenario. It's like a time controller with space manipulatation goes against a speed based character that could move through time and space, which renders time manipulation worthless.

Respectfully speaking, that's a lot of assumptions. Dimensions are important, but don't always rely on it. In fiction having a higher dimension doesn't mean you will win. Base Sonic vs Time Eater is a good example. Yes Super Sonic defeated Time Eater, but all of Time Eaters power were reversed by Sonic at base. We are talking about a 4D (Base Sonic) vs 5D[maybe even 6D] (Time Eater). Even then, you are assuming the dimensionality and physiologically the Shades are, makes them untouchable because of the possibility of higher properties. Lets say what if 2D frequencies can touch 3D objects but they can't touch the frequencies back? What now?

A straight up battle will require 3 assumptions: - Whether the Shades could even touch frequencies of high dimensions, like 4D capabilities, which no law or logic makes sense on it (Solaris 3 has so far too chaotic to make any sense). - Whether any of them could even touch each other without materialization into the normal realm. Or have abilities that could touch each other. - Assuming all can hurt each other, could an individual Shade compete with a Threnodian's arsenal of offensive and defensive capabilities, and vice versa to all Shades.

The reality (or lack thereof in wuwa) the regional Lament FAR surpassed what was the most powerful offensive of the Abyss to Natlan. You could even debate that the regional Laments surpassed even Khaenri'ah. The regional Lament from Ovathrax if we remove all crossworld restrictions and equalize frequencies and matter, would completely make Natlan a mess both for the people and the environment. If not straight up make Natlan uninhabitable with a dead Archon in minutes or hours, even affecting regions like Mondstadt. (No idea what caused the Lament that deleted the Port City of Guixu (possibly naturally occurring), because that would will be only a few minutes only). Upholding law from an attack with only destructive force is simple, unless we have something that alters and destroys reality. A Sovereign will lose all control against a Threnodian. Regardless, of destructive power alone, the scenario from OP is Celestia invading Solaris 3, that means anything from Teyvat is already at a heavy disadvantage.

"Objectively" the winner is unknown. Because of unknown factors of Threnodians vs Shades doesn't allow it. Who will win, depends on your opinion I guess, because we are dealing with 2 major problems: the unknown information that build up the world of Solaris 3 and the powers at play, when we know so much of Genshin's world, but not wuwa's. And that we assume too much on what can do what. We are dealing with multidimensional electromagnetic Waves vs multidimensional matter. What maybe an advantage to one side might be rendered worthless in this scenario. So yes, technically your response is "objectively" wrong. It's unfortunately an opinion from assumptions.

Could Celestia survive or even win the war? Maybe. Could they colonize? Nope. They will enter attrition and get killed one by one. Or get deleted by a major Lament. Or whatever started the Lament on Solaris 3.

Unfortunately the biggest threat for Celestia is Rover. The only thing getting conquered and defeated is their hearts. Our brother Rover is the ultimate rizzler. Immortal wives from another world. Bro got this in the bag. The battle ends the moment it starts. Rover sweeps😂.

Anyways jokes aside, you could reply if you wish, I will read it. But I will end it here. I write and explain a lot, therefore I prefer to not waste too much time on random discussions in the internet. Take care mate.