Piercing Thunder Style (Combat, Style)

You can use the natural reach of a spear or polearm with greater effectiveness.

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

Benefit: While you are wielding a reach weapon, opponents provoke an attack of opportunity from you 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.