JKD Arnis De Mano Deco. Single Arnis Stck Deco. No poses included. Try it before you buy! Please Leave Reviews Below And Concerns On My Page. "Osu no Seishin". Arnis comes from arnes, Old Spanish for armor (harness is an archaic English term for armor which comes from the same roots as the Spanish term). It is derived from the armor costumes used in Moro-moro stage plays where actors fought mock battles using wooden swords. Allegedly, the practice of weaponry by the peasants or Indios was banned by the Spaniards during colonial times and the Moro-moro stick fights were a "disguised" form of continued practice of indigenous martial arts.