Based on the internet fiction series SCP (Secure Contain Protect)
Specifically 5000 (Code Name: Why)
Keter is a classification of an anomalous event/entity difficult to contain and potentially capable of ending the world.
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Music is: ’You Didn’t See Anything’ by Synapse Music
Dialogue is from the SCP game Containment Breech voiced by Aaron Robert McKee (TheVolgun)
Also the video on SCP 500 by The Exploring Series:
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Happy Halloweentime 2020!
I figured K