General | Combat Stamina
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Crippling Critical (Combat, Critical)

Source Advanced Player's Guide pg. 157
You are able to maim a target and hinder its movement.

Prerequisites: Critical Focus, base attack bonus +13.

Benefit: Whenever you score a critical hit against an opponent, its speed is halved for 1 minute. A successful Fortitude save reduces this duration to 1d4 rounds. The DC of this save is equal to 10 + your base attack bonus. Against creatures with multiple types of movement, you must choose which movement type to affect. A flying creature hit by this attack must make a DC 10 Fly check to remain airborne, and has its maneuverability reduced by one step.

Special: You can only apply the effects of one critical feat to a given critical hit unless you possess Critical Mastery.

Combat Trick (from the Combat Stamina feat)

Source Pathfinder Unchained pg. 116
When you confirm a critical hit and attempt to cripple an opponent with this feat, you can spend up to 5 stamina points to increase the DC of this feat’s saving throw by an amount equal to the number of stamina points you spent.