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How do you describe "legendary scale" events/entities?

One I know is an X to end all Xes

Some say X of epic proportions

What other idioms or hyperboles could one use for something "extremely noteworthy"?

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closed as not constructive by simchona, MετάEd, Kit Z. Fox, Andrew Leach, FrustratedWithFormsDesigner Jun 26 '12 at 17:57

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This question is open ended. Avoid asking subjective questions where every answer is equally valid. (from the FAQ) – MετάEd Jun 26 '12 at 17:43

"The mother of all X." = the greatest example of its kind

But it's casual.

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There's the King James idiom, which I think is borrowed from the Hebrew, "X of Xes", as in "Holy of Holies" and "King of Kings".

Of course there are all sorts of superlatives which can be exagerrated to hyperbole: "The greatest X in history", "the best X in the world", etc.

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