is the use of

firearms A firearm is any type of gun designed to be readily carried and used by an individual. The term is legally defined further in different countries (see Legal definitions). The first firearms originated in 10th-century China, when bamboo tubes c ...

gunpowder Gunpowder, also commonly known as black powder to distinguish it from modern smokeless powder, is the earliest known chemical explosive. It consists of a mixture of sulfur, carbon (in the form of charcoal) and potassium nitrate (saltpeter). ...

and

explosive An explosive (or explosive material) is a reactive substance that contains a great amount of potential energy that can produce an explosion if released suddenly, usually accompanied by the production of light, heat, sound, and pressure. An expl ...

s especially by

ninja A or was a covert agent or mercenary in feudal Japan. The functions of a ninja included reconnaissance In military operations, reconnaissance or scouting is the exploration of an area by military forces to obtain information about enem ...

. The history and mythology surrounding

ninjutsu , sometimes used interchangeably with the modern term , is the martial art strategy and tactics of unconventional warfare, guerrilla warfare and espionage purportedly practised by the ninja. ''Ninjutsu'' was a separate discipline in some tradit ...

and kayakujutsu are similar to the history of chemistry and the mythology surrounding

alchemy Alchemy (from Arabic: ''al-kīmiyā''; from Ancient Greek: χυμεία, ''khumeía'') is an ancient branch of natural philosophy, a philosophical and protoscientific tradition that was historically practiced in China, India, the Muslim world, ...

. Thus kayakujutsu mysticism refers to ''elements'' like the Earth (Chi) to develop Fire (Kaji) just as alchemy referred to ''elements'' just as air, earth, fire and water.

References

{{firearm-stub Ninjutsu skills Firearms of Japan