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.
Added Fire Damage
Adds fire damage to a skill.
Added Lightning Damage
Adds lightning damage to a skill.
The attached skill has a chance to Blind enemies it hits, reducing their accuracy.
This skill is cast using life rather than mana.
Cast On Crit
Critical Strikes with the attached attack skill have a chance to cast the attached spell skill.
Cast on Death
The attached spell skill is cast when you die.
Cast on Melee Kill
Kills with the attached melee attack skill have a chance to cast the attached spell skill.
Cast when Damage Taken
When you take damage up to a certain threshold, the attached spell skill is cast.
Cast when Stunned
The attached spell skill has a chance to be cast when you are stunned.
Projectiles chain to nearby enemies as they hit their targets.
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.
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.
Reduces the radius of area of effect skills and increases their damage.
Enemies die when they are reduced to 10% or less life.
Curse On Hit
The attached curse skill has a chance to be applied to any monsters hit by the attached spell or attack skill.
Elemental status effects (for example, freezing or burning) caused by this skill also affect nearby enemies.
The attached skill gem gains additional levels.
Endurance Charge on Melee Stun
Stunning enemies with the attached melee skill grants endurance charges.
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.
Greater Multiple Projectiles
Causes four additional projectiles to be fired by projectile skills.
Increases the skill's accuracy.
Increased Area of Effect
Increases the radius of area of effect skills.
Increased Burning Damage
Burning effects caused by the supported skill do more damage.
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.
Lesser Multiple Projectiles
Causes two additional projectiles to be fired by projectile skills.
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.
Causes single-target melee skills to do damage in an area around the target as well.
Minion and Totem Elemental Resistance
Adds to the elemental resistances of minions and totems.
Increases damage done by minions.
Increases minions life.
Increases minions movement speed.
Causes trap skills to throw three traps instead of one.
Causes melee attacks to repeat quickly, attacking several times instead of once.
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.
Power Charge On Critical
Critical Strikes with the attached skill grant power charges.
Ranged Attack Totem
Summons a totem that can use the attached attack skill.
Reduces the duration of the attached skill.
Reduces the amount of mana used by the skill.
Lays a Remote Mine that can be detonated to use the attached skill.
Causes projectiles to move slower.
Summons a totem that can cast the attached spell skill.
Increases the chance to stun enemies.
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.