Unblinking Flame Fist (Combat)Source Inner Sea Combat pg. 13 (Amazon)
You can exploit the weaknesses in your opponents’ defenses, like a flame seeking fuel to consume.
Prerequisites: Int 13, Wis 13, Combat Expertise, Perfect Style, Stunning Fist, Unblinking Flame Feint, base attack bonus +13 or monk level 13th.
Benefit: When using Perfect Style, the save DC of your stunning fist attack increases by 2 against flat-footed targets. When you spend 1 ki point to gain the benefits of Improved Feint for 1 round, you may attempt a feint as part of your movement when charging.Source Weapon Master's Handbook pg. 25 (Amazon)
You can spend 2 stamina points instead of 1 ki point when using Unblinking Flame Fist.