It is for dueling
Iajutsu focus and the Iajutsu Master were created for one thing only: duels. That's it. And without Iajutsu, you can't do duels. Well, not duels that fit the flavor of a Japanese setting. Most duels to the death were one-hit and dead. How do you simulate that with a d10 weapon on someone over 2nd level?
You can't.
So, they made Iajutsu Focus and put the deuling rules in so you can kill someone better or worse then you depending on your roll. I like it. Without it, the whole dueling aspect of the samurai wouldn't work.
A samurai duel is about skill, control, and a quick finish. They didn't hack each other to bits wearing down hit points with round after round of small damage. They took out their opponent in one deadly strike. See the deul in "The Seven Samurai" for a great example. Then try to apply d20 rules to that situation without using any of the Iajutsu stuff.
Iajutsu focus and the Iajutsu Master were created for one thing only: duels. That's it. And without Iajutsu, you can't do duels. Well, not duels that fit the flavor of a Japanese setting. Most duels to the death were one-hit and dead. How do you simulate that with a d10 weapon on someone over 2nd level?
You can't.
So, they made Iajutsu Focus and put the deuling rules in so you can kill someone better or worse then you depending on your roll. I like it. Without it, the whole dueling aspect of the samurai wouldn't work.
A samurai duel is about skill, control, and a quick finish. They didn't hack each other to bits wearing down hit points with round after round of small damage. They took out their opponent in one deadly strike. See the deul in "The Seven Samurai" for a great example. Then try to apply d20 rules to that situation without using any of the Iajutsu stuff.