False Sky

The false sky is a theory stating that Teyvat's sky and stars are fake.
Explicit proof of the false sky appeared in Natlan as a "split-sky phenomenon" during the Abyss invasion in .
==Theory==
The false sky is first mentioned by Scaramouche in the Unreconciled Stars event, in which he claims that the sky and the stars are a "gigantic hoax." Nahida later learns about this theory from Dottore in exchange for her Gnosis in the . According to Dottore, the false sky is "the secret hidden by Irminsul concerning the 'truth' of this world." 
This theory has been referenced by other groups in the past, such as the Khaenri'ahns, who believed that the Sign of Apaosha reflected a "reality" beyond Teyvat's skies, and King Deshret, who recalled that Nabu Malikata described the night sky to be "adorned with three bright moons," reiterating that the number of moons should be three and suggesting that the single moon visible in Teyvat's sky is an illusion. Mona also remarked that she was taught to talk about the "false sky" during her astrological readings, implying that her teacher, Barbeloth, is aware of its existence.
In the book Before Sun and Moon, Phanes is described to have separated the "microcosm of the world," Teyvat, from the larger universe using his own "eggshell." This so-called eggshell became the false sky of Teyvat, closing it off from the outside world. It is implied that Phanes did this out of love for humanity, but some consider it to be more like a cage. For instance, in the book Springs of Hidden Jade, an alleged daughter of the primordial shade Istaroth describes feeling "trapped within the shell of the starry sky." The Hydro Dragon Sovereign Neuvillette also references the idea of the world being imprisoned in an eggshell, though he advises the Traveler to not be afraid of "bleak desolation and poverty outside the prison."
The archive description of the All-Devouring Narwhal suggests that Teyvat may be protected and isolated from the larger universe by borders created by "a higher power," and that the universe has been "constantly trying to infiltrate Teyvat." This aligns with a comment made by the mage Alice, who noted that Teyvat's borders had grown fragile within the past two years.
The false sky has also been described as an "inverted image" and a "reflection upon the water's surface" — that which is an illusion but "nonetheless hides the truth within itself." This suggests that Teyvat's sky, while fake, does reflect some aspects of the true sky beyond.
==The Split-Sky Phenomenon==
During the Abyssal invasion of Natlan, the Pyro Archon Mavuika channeled power from the six modern incarnations of the heroes who had fought alongside her during the cataclysm, along with Ronova's power, to destroy the rift responsible for the invasion. The sheer force of her strike was substantial enough to break through Teyvat's skies, revealing what appeared to be proof of a false sky, along with a shattered, moon-like celestial body.
Most people paid little attention to this phenomenon, with Mavuika later telling the Traveler that it warranted further investigation, as these celestial occurrences had not been observed in any other nation. She speculated that the Heavenly Principles wished to keep this matter secret, hoping that it would not lead to too much trouble for her. Consequently, she decided to describe it to the public as an "astronomical anomaly," saying she believed most Natlanese would accept this.
The split-sky phenomenon closed shortly afterward, but the shattered celestial body is still faintly visible from Natlan, just to the north of the Great Volcano of Tollan. Notably, "stars" can appear in front of the fragments, supporting the theory that they lie behind a false sky. These fragments can only be seen within Natlan, and they fade out of view around the small shorelines that connect Natlan to the western edge of Sumeru.
Following the defeat of the Abyss, Mavuika informed the Traveler of additional intel she had obtained about the fragments viewed through the phenomenon: they are relics of Secret Source technology referred to as "Ancient Moon's Remnants," and Dottore is involved in a project involving them.
==Trivia==
* The idea of a fabricated world with a sky that reflects the world beyond is strikingly similar to the story of Simulanka, a storybook world created by Hexenzirkel members Alice, Barbeloth, and Andersdotter. 
** When Mona scried the stars, she discovered that fate in Simulanka was directly based on Teyvat, and stated that Simulanka's creator made it "inside a mirror, or a lake, and this world is the reflection."
* The red cubes that appeared in the split-sky phenomenon have a similar appearance to the Unknown God's cubes.
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