The Empty-Scabbard Killers, or Forak-Erach-Naek in an obscure dwarvish dialect, were a legendary order of duergar psionic assassins in Gracklstugh, whom common people believed to be mythical. They were one of the most feared groups in the Underdark. They practiced disciplines unknown to even the savviest derro or the wisest priest. More than a myth, these killers had been plying their trade for centuries, their motives unknown and their methods inscrutable.