Piercing Thunder Style (combat, style)

Prerequisites: Acrobatics 3 ranks, one Piercing Thunder stance known.

Benefit: While you are wielding a reach weapon, opponents provoke an attack of opportunity when they enter a square you threaten. If an opponent would also provoke an attack of opportunity from leaving a threatened square when they do, they still only provoke a single attack of opportunity from you.

Piercing Thunder Push (combat)

Prerequisites: Piercing Thunder Style, Acrobatics 7 ranks.

Benefit: You can ready spears or polearms against charges as if they had the brace quality. If you hit a charging opponent with your readied weapon, you push them back 5 feet (potentially stopping their charge).

Piercing Thunder Trample (combat)

Prerequisites: Piercing Thunder Style, Piercing Thunder Push, Acrobatics 13 ranks.

Benefit: Whenever you charge a creature while wielding a Piercing Thunder discipline weapon, you can make a bull rush attempt and an overrun attempt against the target of your charge. These combat maneuver attempts do not provoke attacks of opportunity, and can be made before or after your charge attack.