You have learned how to make stab wounds more impactful with Piercing Strike.

This technique may be utilized with rapiers, daggers, shortswords, tridents, javelins and pikes.

On your turn when you make a melee weapon attack roll, you may expend one Weapon Technique charge to make the attack a Piercing Strike. Make your attack as normal. Additionally on a hit, you cause a gaping wound on the creature which causes them to suffer one additional die of piercing damage on any attack which causes piercing damage. The effect lasts until the end of you next turn, or the creature regains hit points.

The effect of the Piercing Strike does not stack.

When taking this feat gain the Advanced Weapon Technique Training feat if you do not already have it.