Feyd's Drinker

Commonly used in his black-gloved main-hand during arena bouts, Feyd-Rautha Harkonnen had a small compartment designed that could deliver poison - though usually it was the white-gloved off-hand that carried the poisoned blade. Though most never knew of his treachery, this Unique kindjal became popular on Arrakis for the opposite reason, it was capable of stealing blood from enemies and storing it in the compartment.