Originally Posted by hectorpuppet
Here is a MUCH easier way to earn "A Clash With Evil": Just use the Jitsu of Mijin, which costs you a life but gives you another ninjitsu attack. If you're playing on easy, two of these will kill the boss and you'll unlock it without having thrown a single shuriken.
Thanks, I'll add it to the guide, with credit to you of course. I didn't know how to switch magic until later in the game, so I wasn't aware of how awesome that Jitsu was.