Kunai, along with shuriken, are one of the most common ninja tools. It is a black dagger designed for thrusting and stabbing, though it can still do some damage if thrown despite not being designed for it, and is about the length of one's hand.
Many shinobi attack by attaching an explosive tag to the blade. The kunai is usually thrown so that it lodges in an object near the target, and then the explosion from the attached tag destroys the target. This use of the weapon is known as an explosive kunai.
Kunai vary in ranges from 20cm to 60cm, generally being a short weapon. They're commonly mistakened for knives, which they're not, but rather, they relate moreso to crowbars. Their more common purpose was for digging, and masonry work, although they could be sharpened to make deadly weapons.
Many ninja developed weapons that were merely adapted farming tools. Since kunai were cheaply produced farming tools of a decent size and weight, and could be easily sharpened, they were readily available to be converted into simple weapons.
Kunai require T1 smithing and 15 minerals to create.
Weaponist (T1) --This individual is skilled in the usage of projectile weapons. They have increased speed, accuracy, and they can even add a deadly curve to their arc! Note:
Trained Weaponist (T2) --This individual is a highly trained weaponist. As such they are not to be under-estimated. Each projectile they throw is extremely precise. They are capable of quick drawing weapons, and even ricocheting off objects to hit their target - similar to Sasuke's training regime!
Expert Weaponist (T4) --As an expertly trained weaponist, this person is nothing less than a crack shot. Their projectiles whizz through the air with an impossible degree of difficulty. Their aim is true, and their speed is unrivalled; nigh as fast as a bullet. They are capable of ricocheting weaponry off of others, and even bending the trajectory.
Elemental Weapons (T3). -- able to imbue elements in their weaponry --There is not much in this world more dangerous than a flaming sword. This individual can do just that, capable of imbuing their elemental affinity into their weaponry.
Marksman (T3) --This individual is a expertly trained marksman. They are skilled in delivering long range hits, with deadly accuracy and speed. Combined with Expert Weaponist, weapons may even home in on targets.
For more information, visit the perks page.