The Nimwaith or Pale-folk were a sad and degenerated people, descending from Angmarim-slaves.They were the main slave-caste of the witch-kings re-established Kingdom.
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The Nimwaith may have been the descendants of the angmarian Moorlanders.They might be interpreted as Ghouls in MERP or Rolemaster Rules.There's also been a theory about them being the degenerate descendants of enslaved Wild Hobbits.