In Kendo(swordplay martial art decended from Samurai training) you are supposed to scream Kai during the hit with your sword . It suposedly realeases your ennergie on your hit and the louder the Kai the more intimidatin you sound. A hit in Kendo will not count if the scream is not heard. In partice it sounds like KAIII DO! (A hit the side armor), KAIII Men (A hit center head) etc etc...
In game terms, a Kai gives a temporairy burst of strenth
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