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overlord spoiler
The intermissions are a slow drip. Each book only has a short one and it can be years before a new book comes out.
It gets the point across though.
Anytime there is a "sign" (which predictably adds to Ainz's paranoia) that there might be someone powerful or a powerful force out there, the intermission puts that idea to rest.
overlord spoiler
For instance, there might be a relic from ancient times which appears, then Ainz might take a defensive posture. But, practically speaking, the relic might be limited in it's utility.