u/Dangerous-Junket-957

From the 6.5, we know that Celestia uses different form of energy, not phlogiston like anywhere in Teyvat, it’s called ether, and it’s basically highest form of energy in the universe, on the par with imaginary energy. Quick review what is ether: Ether is the smallest particle of information that forms the Sea of ​​Quanta, or Nihility. The Tree absorbs the ether, partially transforming it into imaginary matter, and together they form the physical universe. Under the influence of the Remembrance and the Enigmata,the ether is transformed into a more complex structure called "memoria," which is the basis for all spiritual matter. In the Tree, etheric clusters and memories form "bubbles" - memory zones called dream worlds. By default, they are empty and can be altered into anything. Due to a violation of symmetry in the Sea, etheric clusters, under the influence of etheric anchors, also form "bubbles" - bubble universes that are distorted copies of worlds created from fragmentary information that fell from the Tree into the Sea. Imaginary energy is a symbol of entropy, while ether represents negentropy, and they mutually generate each other. The second law of thermodynamics is based on entropy and negentropy, which states that if the entropy of a system decreases, this inevitably leads to a marked increase in the entropy of another system. Just as ether forms into memory, on Teyvat the smallest constituent unit of ether or, in other words, the smallest unit of civilization, forming the very essence of memories is called a "memory factor." Particles of memory factors combine into mnemonic clusters, acquire their original form and meaning for civilization, and then gain the ability to recreate recorded information and materialize. When Nicole spoke of the "substance" of which angels are composed, and as usual, she was not allowed to elaborate, we were now finally told that angels are composed of ether. Although technically localized as ether, in the original, it is written not as "ether," but as "void," with the same meaning.

Tdlr GOAT can manipulate energy that all universe exist of. And basically defends Teyvat with the power that counters entropy ( Destruction ) itself, so Its may be reason why Teyvat defined its calculated fate of being destroyed

Extra challenge: Make his appearance aura maxxing

Heres mine: He will appear during 7.3, descending directly to The Tsaritsa with overwhelming pressure, while everyone is stunned one Fatui statist will jump on him and with immense speed got flight into the walls of palace with sweep of the hand. Then Phanes got his eyes in camera and there goes introduction card