Street Carnage
For you, the urban environment becomes another brutal weapon you can use to shred flesh and break bones.
Prerequisite: Str 15, Improved Bull Rush, Improved Unarmed Strike, Power Attack, Street Style†, Street Sweep†, base attack bonus +8 or monk level 7th.
Benefit: While using Street Style, the critical multiplier of your unarmed strikes becomes ×3, instead of ×2.
Source: Ultimate Intrigue, p. 92