Missile Drone (unofficial name) is a new enemy introduced in The Ninja Saviors: Return of the Warriors.
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This enemy appears as a robotic flying drone with four propeller engines which carries a pair of missile launchers. It always floats close to the top of the screen, out of the reach from the player's regular attacks, floating down to launch a barrage of missiles diagonally downwards. They always appear during boss battles depending on the game's difficulty.