When using equipment with linked sockets, Support gems can be linked to Skill gems to augment the skills effect. You can link multiple support gems to a given skill to create interesting and powerful combinations. The following is a list of the announced support gems, and their effect on the skill they are combined with.
Added Chaos Damage
Adds chaos damage to a skill.
Added Cold Damage
Adds cold damage to a skill, giving it a chance to freeze targets.
Added Fire Damage
Adds fire damage to a skill, giving it a chance to ignite targets.
Added Lightning Damage
Adds lightning damage to a skill.
This skill is cast using life rather than mana.
The attached skill ignores some portion of the target's cold resistance.
Cold to Fire
Converts some of the skill's cold damage to fire damage, and increases both cold and fire damage.
Chance to Flee
Monsters affected by the attached skill have a chance to run in terror.
Chance to Ignite
Increases the skill's chance to ignite enemies when dealing fire damage.
Projectiles chain to nearby enemies as they hit their targets.
Concentrate Area of Effect
Reduces the radius of area of effect skills and increases their damage.
Enemies die when they are reduced to 10% or less life.
Elemental status effects (for example, freezing or burning) caused by this skill also affect nearby enemies.
Increases the attack speed of physical skills.
Increases the cast speed of magic skills.
Increases the speed and damage of projectiles.
The attached skill ignores some portion of the target's fire resistance.
Projectiles fork into two new projectiles as they hit their targets.
Increases the skills accuracy.
Increased Area of Effect
Increases the radius of area of effect skills.
Increased Critical Damage
Increases the damage bonus from critical strikes.
Increased Critical Strikes
Increases the chance of causing a critical strike.
Increases the duration of the skill.
Ranged attack skills have the strength melee damage bonus applied to them.
Spells have the strength melee damage bonus applied to them.
Increases the number of items dropped by monsters killed with this skill.
Increases the rarity of items dropped by monsters killed with this skill.
Causes damage from the skill to also knock enemies back.
Life Gain on Hit
Restores players life when they hit an enemy.
Restores players life based on damage dealt to enemies.
The attached skill ignores some portion of the target's lightning resistance.
Restores players mana based on damage dealt to enemies.
Melee Damage on Full Life
While you're on full life, melee skills deal increased damage.
Melee Physical Damage
Increases melee physical damage dealt.
Increases damage done by minions.
Increases minions life.
Increases minions movement speed.
Causes additional projectiles to be fired by projectile skills.
Gives projectile skills a chance to pierce their target and hit additional targets.
Ranged attack skills deal more damage to very close targets and less damage to farther away targets.
Reduced Mana Cost
Reduces the mana cost of the skill.
Lays a Remote Mine that can be detonated to use the attached skill.
Increases the chance to stun enemies.
Summons a totem that can cast the attached skill.
Attached skills can be thrown as traps that use the skill when monsters move near them.
Weapon Elemental Damage
Increases elemental damage dealt by weapons.