>>520663213
https://en.wikipedia.org/wiki/Mordor
>Tolkien stated in his "Guide to the Names in The Lord of the Rings", intended to assist translators, that the phrase "Crack of Doom" derives from William Shakespeare's play Macbeth, Act 4 scene 1.
>Tolkien wrote that the phrase meant "the announcement of the Last Day" by a crack of thunder, or "the sound of the last trump[et]"