Armor penetration cannot increase a target's susceptibility to damage beyond reducing their damage resistance to zero, which means that armor penetration has no effect past the point where a character's resistance ignored reaches an opponent's damage resistance. In PvE it is generally accepted that normal enemies have 22% damage resistance, and bosses have 24%. Because of this, achieving 24% resistance ignored is effectively the "cap" for AP in PvE. In a PvP context, the amount of AP that can be effective depends upon the damage resistance of a given opponent.
 Armor Penetration contribution to Resistance Ignored
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This table shows the relationship between Armor Penetration and the potential for Resistance Ignored. The relationship is a complicated one, because the effect of a point of AP is dependent upon how much AP a character is at already. AP seems to get more effective as it is stacked, up to a certain point at which diminishing returns take effect.
|Character Level||Character Class||Armor Penetration||Resistance Ignored||AP per point of RI|