Resistance penetration

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Elemental penetration is a form of resistance reduction. Penetration is applied as damage is dealt, after other resistance calculations. This means that penetration will reduce a target's resistance even if the target's raw resistance value is far above its maximum resistance cap.[1] Both reduction (e.g. from curses), and penetration can reduce a target's resistance below 0%. There is no minimum resistance floor.

Penetration only affects hits, which notably excludes damage over time effects.[2]

Effectiveness

The percent increase in damage due to penetration can be calculated. First, you must be able to calculate damage done after resistances are applied, we used the following formula

So to calculate the increase in damage from penetration we can use this equation:

It is a simple exercise then, to prove that 1% penetration produces +1% damage against a monster with 0 resistance, and 1% penetration produces +4% damage against a monster with 75 resistance. Clearly, penetration is more useful against high resistance monsters, and less useful against low resistance monsters.

Examples [Expand]

Consider a player using a skill with Penetrates 50% Fire Resistance dealing 100 fire damage to an enemy:

  • If the enemy has +0% Fire resistance
The enemy's resistance will be treated at 50 lower than it is, which in this case will result in an effective −50% fire resistance. The enemy will take 150 fire damage.
  • If the enemy has +25% Fire resistance
This will result in an effective −25% fire resistance. The enemy will take 125 fire damage.
  • The enemy has +150% Fire resistance, but is capped at their maximum fire resistance of 75%
This will result in an effective 25% fire resistance. The enemy will take 75 fire damage.
  • The enemy has +150% Fire resistance, but is capped at their maximum fire resistance of 75%. The enemy is cursed with Flammability before being attacked, which causes them to lose 30% Fire Resistance.
The enemy first loses 30% resistance, bringing them down to +120% fire resistance. They are still well above their maximum, and their resistance value remains at 75%. The 50% penetration then results in an effective 25% fire resistance. The enemy will take 75 fire damage.
  • The enemy has +10% Fire resistance. The enemy is cursed with Flammability before being attacked, which causes them to lose 30% Fire Resistance.
The enemy first loses 30% resistance, bringing them down to −20% fire resistance. The 50% penetration then results in an effective −70% fire resistance. The enemy will take 170 fire damage.

Sources

Support gems

{{#ask:

Has item class::Support Skill Gems
Has subobject.Has stat ids::~base_reduce_enemy_*_resistance*
|?Has name
|?Has inventory icon
|?Has infobox HTML
|?Has level requirement
|?Has intelligence percentage
|?Has dexterity percentage
|?Has strength percentage
|limit=1000
|link=none
|format=template
|introtemplate=SMW item table/skill gem/intro
|template=SMW item table/skill gem
|outrotemplate=SMW item table/skill gem/outro
|named args=yes
|userparam=level=yes, int=yes, dex=yes, str=yes
|intro=Support skill gems that penetrates resistances.
|default=Currently, there are no support skill gems that penetrates resistances.

}}

Unique items

Passive skills

The following passive skills affect penetration: Template:Passive table

Template:Ascendancy passive table

References

  1. Mark_GGG (December 11, 2012). "Penetration gems mess up balance between ele/physical". Official Path of Exile Forums. Retrieved November 1, 2015.
  2. Mark_GGG (November 8, 2013). "Damage over time mechanic change clarification?". Official Path of Exile Forums. Retrieved November 1, 2015.