Support gem

To support an active skill, the support gem has to be placed in a socket linked to the socket of the active gem.

Support gems are socketed in the same way as Skill gems, with the difference that they do not give access to another active skill. Instead, they modify any Skill gems in sockets linked to the support gem, while also typically increasing the mana cost of the skill. The modifications vary based on both the active skill being altered and the support gem, and certain Skill gem - Support gem combinations will leave the skill unmodified. For instance a gem linked with remains unchanged.

Multiple Skill gems may be linked to a Support gem, in which case it will modify all of the skills, and multiple support gems may be linked to a Skill gem, in which case it will be modified by all of them. However, if two copies of a support gem are linked to the same skill, only the higher level gem will be used. If a Body armour contains two copies of a Skill gem linked to different sets of support gems, two separate versions of the skill will be available, each with their own modifications. This may be desirable if for instance one version has been modified for single target damage, while another has been modified for AoE damage.

List of support gems

Id	Name	Primary	Secondary	MCM	Description	Exact Gem Mechanics
H		Template:Int	N/A	130%	Adds chaos damage to a skill.	Adds x-y Chaos Damage
C		Template:Dex	N/A	130%	Adds cold damage to a skill, giving it a chance to freeze targets.	Adds x–y Cold Damage
F		Template:Str	N/A	120%	Adds fire damage to a skill, giving it a chance to ignite targets.	Gain x% of Physical Damage as Extra Fire Damage
L		Template:Int	N/A	130%	Adds lightning damage to a skill.	Adds x–y Lightning Damage
a		Template:Dex	Template:Str	100%	Increases the skills accuracy.	+x to Accuracy Rating
x		Template:Dex	N/A	100%	Chance to blind enemies when hit by supported skills.	10% chance to Blind enemies on hit. x% increased Blinding duration
B		Template:Dex	Template:Int	100%	Reduces enemy block chance.	Enemy Block Chance reduced by x% against this Skill Enemy Dodge Chance reduced by X% against this Skill
L		Template:Str	N/A	125%	Increases Melee Physical Damage against Bleeding enemies	Cannot cause Bleeding. (40-59)% more Melee Physical Damage against Bleeding enemies
B		Template:Str	N/A	245%	This skill is cast using life rather than mana.	Spend Life instead of Mana for Supported Skills
&		Template:Dex	Template:Int	140%	Critical Strikes with the attached attack skill have a chance to cast the attached spell skill.	Supported Attacks have a x% chance to Cast Supported Spells when you Crit an Enemy You cannot Cast Supported Spells directly
!		Template:Dex	Template:Int	100%	The attached spell skill is cast when you die.	You cannot cast supported Spells directly. 100% chance to Cast Supported Non-Minion Spells on Death
&		Template:Str	Template:Int	140%	Kills with the attached melee attack skill have a chance to cast the attached spell skill.	Supported Melee Attacks will Cast Supported Spells on Kill Supported Triggered Spells have x% increased Spell Damage
!		Template:Str	Template:Int	100%	When you take damage up to a certain threshold, the attached spell skill is cast.	This Gem can only Support Skill Gems requiring Level x or lower x% less Damage You cannot Cast Supported Spells directly 100% chance to Cast Supported Spells when you take a total of x Damage
!		Template:Int	Template:Dex	100%	The attached spell skill has a chance to be cast when you are stunned.	You cannot Cast Supported Spells directly x% chance to Cast Supported Spells when Stunned
c		Template:Dex	N/A	150%	Projectiles chain to nearby enemies as they hit their targets.	Chain +2 Times x% less Damage
z		Template:Dex	Template:Int	100%	Monsters affected by the attached skill have a chance to run in terror.	x% Chance to Cause Monsters to Flee
i		Template:Int	N/A	110%	Increases the skill's chance to ignite enemies when dealing fire damage.	x% chance to Ignite
V		Template:Dex	N/A	140%	The attached skill ignores some portion of the target's cold resistance.	Penetrates x% Cold Resistance
x		Template:Str	Template:Int	110%	Converts some of the skill's cold damage to fire damage, and increases both cold and fire damage.	50% of Cold Damage Converted to Fire Damage x% of Cold Damage Added As Fire Damage
o		Template:Int	N/A	140%	Reduces the radius of area of effect skills and increases their damage.	x% more Area Damage 25% less Area of Effect radius
X		Template:Dex	N/A	110%	Enemies die when they are reduced to 10% or less life.	Kills Enemies on 10% Life or less when hit by supported Skills x% increased Damage
&		Template:Int	N/A	100%	Causes a linked curse to cast when the player makes a successful hit.	x% reduced Curse Duration Supported Skills apply supported Curses on Hit You cannot Cast Supported Curses
S		Template:Int	N/A	140%	Elemental status effects (for example, freezing or burning) caused by this skill also affect nearby enemies.	Elemental Status Effects caused by supported Skills spread to other enemies Radius: 12 Supported skills deal x% less damage
+		Template:Str	N/A	125%	Increases the level of active gems.	+x to Level of Supported Active Skill Gems
e		Template:Str	N/A	110%	Grants an Endurance Charge when an enemy is stunned in melee.	x% reduced Enemy Stun Threshold Gain an Endurance Charge if you Stun an Enemy with Melee Damage
+		Template:Dex	N/A	115%	Increases the quality bonus of active gems.	+X% to Quality of Supported Active Skill Gems
+		Template:Int	N/A	100%	Reduces the mana cost and mana reservation of gems.	+5% increased gem Experience
A		Template:Dex	N/A	115%	Increases the attack speed of attacks.	x% increased Attack Speed
f		Template:Int	N/A	120%	Increases the cast speed of spells.	x% increased Cast Speed
j		Template:Dex	N/A	110%	Increases the speed and damage of projectiles.	x% increased Projectile Speed x% increased Projectile Damage
V		Template:Str	N/A	140%	The attached skill ignores some portion of the target's fire resistance.	Penetrates x% Fire Resistance
Y		Template:Dex	N/A	115%	Projectiles fork into two new projectiles as they hit their targets.	Projectiles Fork (30 to 11)% less Projectile Damage
O		Template:Str	N/A	110%	Gives the player the Fortify buff.	(25 to 44)% increased Melee Physical Damage Grants Fortify on Melee hit 25% increased Fortify duration
G		Template:Str	Template:Int	100%	Increases the effect of your auras on allies but prevents them affecting you.	x% increased effect of Auras Supported Auras do not affect You
P		Template:Dex	N/A	165%	Causes four additional projectiles to be fired by projectile skills.	4 additional Projectiles x% less Projectile Damage
D		Template:Dex	N/A	120%	Increases the damage to chilled enemies and chance to freeze enemies which are chilled.	x% more Damage to Chilled Enemies 10% chance to Freeze Enemies which are Chilled
K		Template:Dex	N/A	120%	Increases chance to freeze and grants a chance to gain a Frenzy Charge on killing a frozen enemy.	x% chance to gain a Frenzy Charge on Killing a Frozen Enemy 10% chance to Freeze enemies
E		Template:Int	N/A	140%	Increases the radius of area of effect skills.	x% increased Area of Effect radius
b		Template:Str	Template:Int	120%	Increases the damage from burning status effect.	x% increased Burning Damage
c		Template:Int	N/A	130%	Increases the damage bonus from critical strikes.	x% increased Critical Strike Multiplier
s		Template:Int	N/A	115%	Increases the chance of causing a critical strike.	x% increased Critical Strike Chance
D		Template:Str	N/A	140%	Increases the duration of the skill.	x% increased Skill Effect Duration
K		Template:Int	N/A	120%	Adds percent chance to shock to a skill. Grants Onslaught buff for a short duration on killing a shocked enemy with supported skill(s).	x% chance to Shock Gain Onslaught for y seconds on Killing a Shocked Enemy
i		Template:Str	N/A	100%	Ranged attack skills have the strength melee damage bonus applied to them.	x% increased Projectile Damage Strength's damage bonus applies to Projectile Attacks made with Supported Skills
W		Template:Str	N/A	100%	Spells have the strength melee damage bonus applied to them.	x% increased Spell Damage Strength's damage bonus applies to Spell Damage as well for Supported Skills
Q		Template:Str	N/A	100%	Increases the number of items dropped by monsters killed with this skill.	x% increased Quantity of Items Dropped by Slain Enemies
R		Template:Int	N/A	100%	Increases the rarity of items dropped by monsters killed with this skill.	x% increased Rarity of Items Dropped by Slain enemies
k		Template:Str	N/A	100%	Causes damage from the skill to also knock enemies back.	x% chance to Knock enemies Back on hit 50% Increased Knockback Distance
l		Template:Dex	N/A	140%	Causes two additional projectiles to be fired by projectile skills.	2 additional Projectiles x% less Projectile Damage
h		Template:Str	N/A	150%	Restores players life when they hit an enemy.	+x Life gained for each enemy hit by your Attacks
l		Template:Str	N/A	130%	Restores players life based on damage dealt to enemies.	2% of Damage Leeched as Life x% increased Life Leech rate
V		Template:Int	N/A	140%	The attached skill ignores some portion of the target's lightning resistance.	Penetrates x% Lightning Resistance
m		Template:Dex	N/A	100%	Restores players mana based on damage dealt to enemies.	2% of Damage Leeched as Mana x% increased mana leeched per second
f		Template:Str	N/A	130%	While you're on full life, melee skills deal increased damage.	x% more Melee Physical Damage when on Full Life
M		Template:Str	N/A	140%	Increases melee physical damage dealt.	x% more Melee Physical Damage
S		Template:Str	N/A	160%	Adds AoE damage to a single target melee attack.	x% less Damage to main target x% less Damage to other targets Single-Target Melee attacks deal Splash Damage to Surrounding Targets
r		Template:Int	Template:Str	140%	Increases elemental resistances of minions and totems.	Totems and Minions summoned by Supported Skills have +x% Fire Resistance Totems and Minions summoned by Supported Skills have +x% Cold Resistance Totems and Minions summoned by Supported Skills have +x% Lightning Resistance
d		Template:Int	N/A	130%	Increases damage done by minions.	Minions deal x% more Damage
n		Template:Int	N/A	140%	Increases minions' life.	Minions have x% increased maximum Life
e		Template:Int	N/A	150%	Increases minions' movement speed.	Minions have x% increased Movement Speed Minions have x% increased Attack Speed Minions have x% increased Cast Speed
t		Template:Dex	Template:Int	160%	Allows more traps.	Can set up to 3 additional Traps Throw 2 additional Traps x% less Damage
3		Template:Str	Template:Dex	180%	Causes you to attack quickly 3 times, selects different targets (if available).	Supported Melee Attacks repeat 2 additional times x% more Attack Speed 30% less Attack Damage
d		Template:Dex	N/A	120%	Increases projectile physical damage dealt.	x% more Physical Projectile Attack Damage 10% less Projectile Attack Speed
x		Template:Int	Template:Str	110%	Converts some of the skill's physical damage to lightning damage, and increases both physical and lightning damage.	Gain x% of Physical Damage as Extra Lightning Damage 50% of Physical Damage Converted to Lightning Damage
p		Template:Dex	N/A	110%	Gives projectile skills a chance to pierce their target and hit additional targets.	x% chance of Projectiles Piercing
b		Template:Dex	N/A	120%	Ranged attack skills deal more damage to very close targets and less damage to farther away targets.	Projectile Attacks deal up to 50% more Damage to targets at the start of their movement, dealing less Damage to targets as the projectile travels further
P		Template:Int	N/A	110%	Critical strikes have a chance of granting you a Power Charge.	x% chance to gain a Power Charge on Critical Strike
R		Template:Str	Template:Dex	200%	Summons a totem that can use the attached attack.	Supported Attack Skills cannot be used with Melee Weapons 50% less Damage Summons a Totem which uses this skill Totem lasts 8 seconds Attacks used by Totem have 30% less Attack Speed
d		Template:Str	N/A	120%	Reduces the effect duration.	x% less Skill Effect Duration
r		Template:Str	N/A	100%	Reduces the mana cost of the skill. Is additive with reduced mana from Passive tree.	x% reduced Mana Cost
Y		Template:Int	Template:Dex	150%	Lays a Remote Mine that can be detonated to use the attached spell.	Supported Attack Skills cannot be used with Melee Weapons x% more Mine Damage Places a Remote Mine which uses this skill when detonated Mine lasts 16 seconds
J		Template:Dex	N/A	140%	Slows down projectiles.	x% less Projectile Speed x% more Projectile Damage
k		Template:Int	N/A	140%	Supported spells are cast twice.	Spells Repeat an additional time 10% less Damage x% more Cast Speed
T		Template:Str	Template:Int	200%	Summons a totem that can use the attached spell.	x% less Damage Summons a Totem which uses this Skill Totem lasts 8 seconds Spells Cast by Totem have 30% less Cast Speed
t		Template:Str	N/A	100%	Increases the chance to stun enemies.	x% reduced Enemy Stun Threshold
T		Template:Dex	Template:Int	140%	Attached skills can be thrown as traps that use the skill when monsters move near them.	Supported Attack Skills cannot be used with Melee Weapons Throws a Trap which uses this Skill when triggered Trap lasts 16 seconds x% more Trap Damage
W		Template:Dex	Template:Int	130%	Increases Trap and Mine damage but lowers.	x% more Trap and Mine Damage 10% reduced Trap Throwing Speed 10% reduced Mine Laying Speed
W		Template:Str	Template:Int	150%	Increases elemental damage dealt by weapons.	x% more Weapon Elemental Damage