Fukimi-bari
(mouth darts): These small darts are held in the mouth and blown into the face of an opponent as a surprise attack. Up to 10 of them can be carried in the mouth. They can be fired singly or all at once. Obviously, since the darts are carried in the mouth, they cannot be poisoned (unless the ninja is willing to suffer the effects of the poison as well). Furthermore, the darts have a very poor range and are almost never effective against any type of armor; wielders of this weapon suffer a -6 penalty to the attack roll when firing at an armored target. However, these darts do have the advantage of surprise and distraction because they are a hidden weapon.
"These are some pretty cool Fukimi-bari! If only we were in the Amazon where we could find some poisonous frogs to make them even more deadly (since we are ninjas... we can do that). Then we could blow these mouth darts with our water drinkers and effectively hit out target" Said Nate.