What if the Vault of Glass isn't a real place? What if it's all just a simulation? I know this is an extraordinary claim, so naturally I require extraordinary evidence. Since this is just a small theory, I have little, but will give what I have.
We know the Vex can indoctrinate people into simulations, forcing them into a world of eternal torment and creating identical copies of the victims. The Vault also contains unknown power, seemingly impossible to even comprehend, let alone put into practice. This power can not be manifested outside of it, so we know the Vault has to have some sort of mystical power around it, or does it not exist altogether? Gorgons can bend the fabric of reality at their will, deciding what [b]"is and is not real"[/b]. Anything they perceive becomes "subject to erasure". However, Gorgons aren't the only entities with reality-bending capabilities. The Templar, Oracles, and Atheon all possess it as well.
Going back to what I said earlier about "creating identical copies of the victims", I believe this is put into practice inside of the Vault. Kabr sacrificed himself in the Vault in order to create the Relic, which is the weapon vital to defeating essentially every boss in the Vault (this could be interpreted as Kabr creating a "glitch" in the Vex's simulation). Now this in itself isn't ground-breaking news, but what comes next just may be. His final words were, "If I speak again, I am not Kabr." This is a peculiar sentence, and oddly placed. This inclines me to theorize that the Vault of Glass is not as real as it seems. It appears to me that once that Spire is built, everything afterwards is just a simulation.
Obviously, this theory isn't perfect. It has its fair share of holes and fallacies, but I implore you, just take it into consideration the next time you step foot into the Vault of Glass. You never know what you may notice.
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It's like the impossible test from Star Trek. It was ultimately defeated by Kirk when he reprogrammed the simulation. Kirk=Kabr. Reprogram=create relic. Mind blown.