Stealthy Assassins, or Ninjas, are a type of covert agent or mercenary in feudal Japan. They were trained in the martial arts and were hired for their skills in espionage, sabotage, infiltration, and assassination. Ninjas were known for their ability to move silently and remain undetected, making them ideal for covert operations. They were also known for their use of specialized weapons and tools, such as shuriken and smoke bombs. Ninjas were often employed by samurai warlords to carry out missions that required secrecy and precision.