Fart arrows are trick arrows used by the Hunters of Artemis that explode into a cloud of nasty smelling yellow-green smoke, most likely sulfur, when they hit something.
Percy Jackson and the Olympians[]
The Titan's Curse[]
These arrows are used by the Hunters of Artemis in the game of Capture the Flag. Thalia complained that the Hunters using them in the game is unfair since it was 'unsportsmanlike'.
Purpose[]
The arrows are very useful for temporarily stunning enemies and clouding their vision with nasty smelling yellow-green smoke, whenever they hit something. When Percy describes the smell, he says that they "smell like rotten eggs," the scent of sulfur.