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Penetration, or “Pen”, comes in various forms and types. Like Damage and Defense, it is divided specifically into Basic and Ability.

Penetration Forms[]

  • Base Pen, where you personally ignore an amount of your opponent’s Defense.
  • Shred, where you lower an opponent’s Defense and they take more damage from any source (including your teammates).
  • Steal, where you lower and opponent’s Defense while also increasing your own by the same amount.

Penetration Types[]

  • % Pen
  • Flat Pen
  • % Reduction
  • Flat Reduction

The forms are important to know as what they do can affect how you play, the types are important as they are applied in a specific order and it alters how much damage you deal.

Formula[]

[Defense - (Flat Reduction + Flat Pen)] x [1 - (% Reduction + % Pen)] = FinalResistRating

In simple terms, using Flat Pen will alter the potency of % Pen. Flat Pen (like the bonus stat on Guard Piercer) never loses value, but having it or putting the effects of Gems like Shredding Strikes or Armor Aura on a target will reduce the effectiveness of a Gem like Piercing Basic.

To look at other ways one can take more/less damage you need to go back to the entire, complicated damage formula and pull out some key terms. The first of these goes right in line with everything just showed about Pen.

Negative Armor[]

The simplified damage formula works in all cases unless your opponent has enough forms of Pen to completely remove your Defense Rating and still apply more Pen. In this case you are subject to something called “Negative Defense”, where you will take more damage than if you simply had a Defense Rating of zero.

The formula for Negative Defense is:

Health Lost = Damage Taken [1 + (1 - 0.99 ^ |Defense| )]

Mechanics
Hero AbilitiesAffinities (Death/Chaos/Growth/Knowledge/Order) ● AuraBasic and Ability ArmorAttributes (Agility/Vitality/Intellect) ● CardsCooldownCooldown ReductionExperienceJumpGemsGoldHealthManaMovement Speed (Movement Speed Penalty)
Attack Armor PenetrationAttack SpeedBasic AttackBasic Attack TimeBasic Attack ModifiersDamage over timeLifestealPower
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World AgoraMinimapBackdoor ProtectionCoreFog WallsFountainJump PadMinionsNeutral Monsters (Aqua Camp/Black Camp/Fangtooth/Gold Camp/Green Camp/Prime Helix Guardian/River Camp/White Camp) ● TowerWards
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Legacy Red CampBlue CampAltarAmber LinkHarvester (Harvester Keys) ● RaptorsShadow PadsTravel Mode
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