Ok, I reached the crystal decision, 3rd floor of Gay Garrison.
Let me take just a minute to note how moronic of the story writers it is to decide that humans and celestials would combine their forces, for the supremely important task of designing a protective system against the abyss, and should be so dumb as to design a system with a single point of failure. If this obelisk breaks the whole barrier goes down. Amazing writing.
Other than that, I think someone on the writing team unintentionally described Russian society and history in two-three paragraphs:
Once again the clearly more evil decision is to prolong the suffering of those who suffer, by choosing the superficially "good" course of action. I don't know if they realized that, and I should give them points for it, or not.