A thief with this ability can sneak attack opponents with such precision that
their blows weaken and hamper them. An opponent damaged by such a sneak
attack also temporarily loses some of their strength.
* Ability points lost to crippling strikes return slowly on their own at over
the course of a couple of days.
* This feat is only available to members of the thieves' guild.
* This feat can only be trained when a bonus feat point is available.
* This feat is only available to thieves who have a bonus feat point.