Recently I've building a ninja around unarmed and debugging tactics such as taking advantage of the pressure point ninja trick. While watching the dark knight returns and seeing Batman taking advantage of how a small cut above the eye can bleed and blind an opponent I thought I recalled a trick or called shot that does this but it turned out to be the second level necromancy spell brow gash.
How would you guys structure a home brewed ninja trick or use a called shot to reach a similar maybe less powerful effect.