How does Pierce work?
Updated. “Chance to pierce monster” is the skill’s description and that’s exactly what it does. Investing point in this skill gives your arrow or javelin a chance to pierce through the monster and hit another monster in the projectile’s way. This can be useful in several aspects. For starters, in most narrow dungeons (Maggot Lair, especially) you can fire your favourite skills (Freezing Arrow for example!) and inflict damage upon the row of enemies that are tightly packed. Also, Pierce will increase the damage potential of Guided Arrow because after Guided Arrow pierces, it will come back to hit the monster it originally homed in on (and it will STILL have a chance to pierce yet again!). Pierce benefits most from skills that give an effect upon hitting a monster to give extra discharges. A few examples of such skills are Frozen Arrow, Immolation Arrow and Lightning Fury. It is of course always good for other ranged attacks, so they hit multiple monsters that are advancing towards you.