The Ithryn Luin are guessed to have founded "magic cults", perhaps in service of Sauron, perhaps not, but anyways, those cults overlasted the fall of Sauron. Nothing else is mentioned, except that Tolkien "fears" they fell and became Sauron's servants.
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"Out of doubt, out of dark to the day's rising I came singing in the sun, sword unsheathing. To hope's end I rode and to heart's breaking: Now for wrath, now for ruin and a red nightfall!"
~Eomer
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