You draw upon your strength of ki to temporarily debilitate your foes with precise strikes against their nerves.
Prerequisite: Dex 13, Wis 15, Ki Pool class feature, Improved Unarmed Strike, Stunning Fist, Weapon Focus (Unarmed Strike), base attack bonus +10.
Benefit: Each use of this feat counts as a use of Stunning Fist for the day. You must have at least 1 point of ki remaining in your ki pool to use this feat. You may use this feat no more than once per round. You must declare that you are using this feat before you make your attack roll (thus, a failed attack roll ruins the attempt). Pain Touch forces a foe damaged by your unarmed attack to make a Fortitude saving throw (DC 10 + 1/2 your character level + your Wis modifier), in addition to dealing damage normaly. A defender who fails this saving throw suffers 1d4 points of ability damage to his Strength score. A successful saving throw reduces the ability damage to 1 point. The damage from this feat cannot reduce a foe's ability score to less than a score of 3. This damage is temporary and is automatically restored after ten minutes of rest. Constructs, oozes, plants, undead, incorporeal creatures, and creatures immune to critical hits cannot be affected by this feat.
Special: If a monk meets all other prerequisites listed, he may ignore the base attack bonus requirement in order to select this feat.
I see it as the 'nerve cluster' attack so common to many martial arts legends and tall tales. Something that weakens your opponent so that he hits less often and his blows are not as powerful.
Too much? Too meh? Let me know what you think; I'm not real good with custom feats.
Master Arminas
Would not take.
Here's my suggestion:
Improved Stunning Fist
Prerequisite: Stunning Fist, BaB +3.
Benefit: When you use Stunning Fist, instead of stunning the target, you can cause it to become sickened for 1 minute. The target still receives a saving throw to negate the effect.
Special: If you are a Monk, disregard the benefit above. Instead, the effect (but not save DC or uses per day) of your Stunning Fist works as if you were four levels higher.
Sickened is worth about 4 points of strength damage.
Ah, at 8th level, a monk can already make an opponent sickened for 1 minute (instead of stunned for 1 round) with stunning fist. He can, instead (at 4th level) make the target fatigued, staggered for 1d6+1 rounds (12th level), blind or deafened (16th level), or paralyzed for 1d6+1 rounds (20th level).
Of course, the target gets a Fortitude save vs. all of those effects to negate.
Ability damage is not something the 'normal' monk can do, and yet it makes sense given the myths and legends of fiction and film. To me, at least.
Master Arminas
I like this idea, but once per round is too much. I've seen demonstrations of 'ki-cutting' and they usually do not require contact at all.
I would suggest:
Make it cost ki.
Make it a touch attack that doesn't deal damage.
Make it usable once per foe, perhaps, so you can't beat down enemies with this alone, but instead use it as a 'de-buffer'.