Crippling Critical
Prerequisites: Base attack bonus +3
Benefit: Whenever you score a critical hit against an opponent, its speed is halved permanently. 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. This effect can be removed with a DC 20 Heal skill check.