Impaling Critical (Feat)

Your critical hits can skewer your foes.

Prerequisites: BAB +11, Critical Focus (Feat), Weapon Specialization (Feat) with selected piercing melee weapon

Benefit: Whenever you score a critical hit with the selected piercing melee weapon, you can impale your opponent on your weapon. While your opponent is impaled in this way, each time he starts his turn, you deal damage equal to your weapon's damage dice plus the extra damage dice from your weapon's properties. As an immediate action, you can pull your weapon out of your opponent. If your opponent is ever outside your reach, you must spend a free action to let go of your weapon or an immediate action to pull it out of him. Your opponent can also spend a move action to pull your weapon out. When the weapon comes out, your opponent takes damage as if starting his turn impaled. While you impale your opponent with your weapon, you cannot use it to attack, and you must hold on to it. If you let go of the weapon, the impaled opponent no longer takes damage from the weapon at the start of his turn.