I understand the scale of a cosmos. It isn't [u]everything[/u] technically. That technicality goes beyond a single universe though.
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Everything we know about them, or it, whichever it may be, is only observation taken by single dimensional beings and constructs. We don't know if they span dimensions and universes, but they very well could, being ultra powerful and all.
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Cosmic destruction would include the dimensions within said cosmos.