Ninja

A ninja or shinobi was a covert agent or mercenary of feudal Japan, specializing in unorthodox arts of war. The functions of the ninja included espionage,sabotage, infiltration, and assassination, as well as open combat in certain situations. The ninja, using covert methods of waging war, were contrasted with the samurai, who had strict rules about honor and combat.

The mysterious nature of the ninja has long captured popular
imagination in Japan, and later the rest of the world. Ninjas figure prominently in folklore and legend, and as a result it is often difficult to separate historical fact from myth. Some legendary abilities include invisibility, walking on water, and control over natural elements.