Increases Kunai Splash and Kunai Explosion damage by 20%.
Increases Kunai Splash and Kunai Explosion damage by additional 10% per 3 refine rate.
If refine rate is 9 or higher, increases Kunai Splash and Kunai Explosion damage by additional 20%.
If refine rate is 11 or higher, increases Kunai Splash and Kunai Explosion damage by additional 20%.