Spiked Destroyer (Combat)Source Inner Sea Gods pg. 216 (Amazon), Faiths of Balance pg. 24 (Amazon)
You can attack with your armor spikes while using bull rush or overrun.
Prerequisites: Proficient with armor spikes.
Benefit: When you succeed at a bull rush or overrun combat maneuver, you may automatically make an attack roll with your armor spikes against the target of the maneuver as a swift action, using your highest attack bonus.Source Weapon Master's Handbook pg. 25 (Amazon)
You can spend 4 stamina points after succeeding at a bull rush or overrun combat maneuver check to use Spiked Destroyer against that target as a free action.