[Source] The poison blade was a Sith sword found in the tomb of Naga Sadow on Korriban by Revan during his infiltration of the Sith Academy during the Jedi Civil War. As its name would suggest, the blade was poisoned and would inflict poisonous effects upon its victims. Of course, not all poison blades were of Sith design. At least one form was popular with the mysterious GenoHaradan bounty hunters.