Utilizing Mamushi, Kōsa causes the serpent puppet to launch poison coated senbon at an enemy. The high speed of the senbon makes this technique a difficult one to avoid. The poison will not cause any symptoms at first, but after an hour (or shorter if the afflicted has been fighting) the person afflicted by the poison will experience nausea, extreme fatigue and finally severe pain in the lungs, with each breath causing agony. The person afflicted by the poison will die within two days without an antidote.