Penetration Ref /23
Resistance Penetration
Penetration causes the target's corresponding Resistance to be treated as lower than its actual value by the specified amount when of calculating Damage taken from your Hits. Resistances can only be Penetrated down to a minimum of 0% by default.

Since Penetration only affects Hits and applies to the target's defensive stats rather than your own offensive stats, it does not affect damage with Ailments.
(60–100)% increased Energy Shield
+(60–100) to maximum Mana
(10–15)% increased Rarity of Items found
Your Hits can Penetrate Elemental Resistances down to a minimum of -50%
Supports any skill that Hits enemies, making those Hits Penetrate enemy Fire resistance.
Supports any skill that Hits enemies, making those Hits Penetrate enemy Cold resistance.
Supports any skill that Hits enemies, making those Hits Penetrate enemy Lightning resistance.
15% increased Fire Damage
10% increased Ignite Magnitude
30% increased chance to Shock
8% increased Area of Effect for Attacks
15% increased Duration of Ailments against Enemies with Exposure
15% increased Duration of Damaging Ailments on Enemies
20% increased chance to inflict Ailments against Enemies with Exposure
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