Penetration

Gem · Offensive

Minimum Forge: from this level on the effect comes from the gem chest, PvE drops and cutting. Above the active limit the strongest gems count; the rest stay socketed with no effect.

Domain: Offensive
Class: Combat
Socket: Fury (Main Weapon, Off-hand, Right Glove, Left Glove) or Prismatic
Prismatic socket: always on Necklace, Ring; on other pieces the last socket may roll prismatic: Epic 10% · Legendary 35%
Minimum Forge: level 8
Active limit: 30 combat gems per hero
Fusion, cutting and chest: Gems

What it does

Lets the hero ignore part of the opponent’s defense.

Where it works

Battle is every march with a hero (PvE, PvP and oases), resolved at once by the strength of both sides. Duels are blow by blow.

Mode	Effect
Battle	Ignores part of the target’s defense, in proportion to the hero’s share of the march’s attack.
GvG duel	Lowers the opponent’s defense before every blow.
Colossus	No effect: the Colossus has no defense.

Value per tier

Value of each attribute on the gem. On a 2-attribute gem each one is worth less than alone; it appears from Tier III (from the gem chest, with the Forge at level 8) and only fits a Prismatic socket.

Tier	1 attribute	2 attributes
Tier I	+0.8%	—
Tier II	+1.5%	—
Tier III	+3%	+1.2%
Tier IV	+5.5%	+2.2%
Tier V	+9.5%	+3.8%
Tier VI	+16%	+6.4%

Caps

The gem cap applies to the sum of the hero’s active gems; past the start of diminishing returns, each point is worth less. The same attribute from equipment comes on top of that cap and only stops at the battle cap.

Gem cap: 20%
Diminishing returns: above 12%, each point is worth 50%
Battle cap (gems + equipment): 60%
GvG duel cap: 60%

Other offensive gems

Attack — Offensive · +1.5% to +32% per gem
Crit Chance — Offensive · +0.8% to +16% per gem
Crit Damage — Offensive · +1.5% to +32% per gem
Lifesteal — Offensive · +0.6% to +12.8% per gem
Precision — Offensive · +0.8% to +16% per gem