Exploit Weakness (Ex)
At 4th level, as a swift action, a martial artist can observe a creature or object to find its weak point by making a Wisdom check and adding his monk level against a DC of 10 + the object’s hardness or the target’s CR. If the check succeeds, the martial artist gains a +2 bonus on attack rolls until the end of his turn, and any attacks he makes until the end of his turn ignore the creature or object’s DR or hardness.
A martial artist may instead use this ability as a swift action to analyze the movements and expressions of one creature within 30 feet, granting a bonus on Sense Motive checks and Reflex saves and a dodge bonus to AC against that opponent equal to 1/2 his monk level until the start of his next turn.
This ability replaces ki pool.