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 Clarity gem linked with Added Fire damage 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 armor contains two copies of a Skill gem linked to different sets of support gems, two seperate 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
H		Template:Int	N/A	150%	Adds chaos damage to a skill.
C		Template:Dex	N/A	140%	Adds cold damage to a skill, giving it a chance to freeze targets.
F		Template:Str	N/A	130%	Adds fire damage to a skill, giving it a chance to ignite targets.
L		Template:Int	N/A	140%	Adds lightning damage to a skill.
a		Template:Dex	Template:Str	100%	Increases the skills accuracy.
x		Template:Dex	N/A	100%	Chance to blind enemies when hit by supported skills.
B		Template:Dex	Template:Int	125%	Reduces enemy block chance.
B		Template:Str	N/A	245%	This skill is cast using life rather than mana.
&		Template:Dex	Template:Int	140%	Critical Strikes with the attached attack skill have a chance to cast the attached spell skill.
!		Template:Dex	Template:Int	100%	The attached spell skill is cast when you die.
&		Template:Str	Template:Int	140%	Kills with the attached melee attack skill have a chance to cast the attached spell skill.
!		Template:Str	Template:Int	100%	When you take damage up to a certain threshold, the attached spell skill is cast.
!		Template:Int	Template:Dex	100%	The attached spell skill has a chance to be cast when you are stunned.
c		Template:Dex	N/A	200%	Projectiles chain to nearby enemies as they hit their targets.
z		Template:Dex	Template:Int	100%	Monsters affected by the attached skill have a chance to run in terror.
i		Template:Int	N/A	110%	Increases the skill's chance to ignite enemies when dealing fire damage.
V		Template:Dex	N/A	150%	The attached skill ignores some portion of the target's cold resistance.
x		Template:Str	Template:Int	100%	Converts some of the skill's cold damage to fire damage, and increases both cold and fire damage.
o		Template:Int	N/A	160%	Reduces the radius of area of effect skills and increases their damage.
X		Template:Dex	N/A	110%	Enemies die when they are reduced to 10% or less life.
&		Template:Int	N/A	100%	Causes a linked curse to cast when the player makes a successful hit.
S		Template:Int	N/A	140%	Elemental status effects (for example, freezing or burning) caused by this skill also affect nearby enemies.
+		Template:Str	N/A	125%	Increases the level of active gems.
e		Template:Str	N/A	110%	Grants an Endurance Charge when an enemy is stunned in melee.
+		Template:Dex	N/A	125%	Increases the quality bonus of active gems.
+		Template:Int	N/A	125%	Increases the experience gain of active gems.
A		Template:Dex	N/A	115%	Increases the attack speed of attacks.
f		Template:Int	N/A	120%	Increases the cast speed of spells.
j		Template:Dex	N/A	110%	Increases the speed and damage of projectiles.
V		Template:Str	N/A	140%	The attached skill ignores some portion of the target's fire resistance.
Y		Template:Dex	N/A	125%	Projectiles fork into two new projectiles as they hit their targets.
P		Template:Dex	N/A	200%	Causes four additional projectiles to be fired by projectile skills.
E		Template:Int	N/A	150%	Increases the radius of area of effect skills.
b		Template:Str	Template:Int	120%	Increases the damage from burning status effect.
c		Template:Int	N/A	130%	Increases the damage bonus from critical strikes.
s		Template:Int	N/A	115%	Increases the chance of causing a critical strike.
D		Template:Str	N/A	150%	Increases the duration of the skill.
i		Template:Str	N/A	100%	Ranged attack skills have the strength melee damage bonus applied to them.
W		Template:Str	N/A	100%	Spells have the strength melee damage bonus applied to them.
Q		Template:Str	N/A	100%	Increases the number of items dropped by monsters killed with this skill.
R		Template:Int	N/A	100%	Increases the rarity of items dropped by monsters killed with this skill.
k		Template:Str	N/A	100%	Causes damage from the skill to also knock enemies back.
l		Template:Dex	N/A	150%	Causes two additional projectiles to be fired by projectile skills.
h		Template:Str	N/A	150%	Restores players life when they hit an enemy.
l		Template:Str	N/A	130%	Restores players life based on damage dealt to enemies.
V		Template:Int	N/A	150%	The attached skill ignores some portion of the target's lightning resistance.
m		Template:Dex	N/A	100%	Restores players mana based on damage dealt to enemies.
f		Template:Str	N/A	130%	While you're on full life, melee skills deal increased damage.
M		Template:Str	N/A	140%	Increases melee physical damage dealt.
S		Template:Str	N/A	160%	Adds AoE damage to a single target melee attack.
r		Template:Int	Template:Str	140%	Increases elemental resistances of minions and totems.
d		Template:Int	N/A	150%	Increases damage done by minions.
n		Template:Int	N/A	140%	Increases minions' life.
e		Template:Int	N/A	150%	Increases minions' movement speed.
t		Template:Dex	Template:Int	160%	Allows more traps.
3		Template:Str	Template:Dex	180%	Causes you to attack quickly 3 times, selects different targets (if available).
d		Template:Dex	N/A	120%	Increases projectile physical damage dealt.
p		Template:Dex	N/A	110%	Gives projectile skills a chance to pierce their target and hit additional targets.
b		Template:Dex	N/A	120%	Ranged attack skills deal more damage to very close targets and less damage to farther away targets.
P		Template:Int	N/A	110%	Critical strikes have a chance of granting you a Power Charge.
R		Template:Str	Template:Dex	250%	Summons a totem that can use the attached attack.
d		Template:Str	N/A	120%	Reduces the effect duration.
r		Template:Str	N/A	90%	Reduces the mana cost of the skill.
Y		Template:Int	Template:Dex	150%	Lays a Remote Mine that can be detonated to use the attached spell.
J		Template:Dex	N/A	140%	Slows down projectiles.
k		Template:Int	N/A	130%	Supported spells are cast twice.
T		Template:Str	Template:Int	250%	Summons a totem that can use the attached spell.
t		Template:Str	N/A	100%	Increases the chance to stun enemies.
T		Template:Dex	Template:Int	140%	Attached skills can be thrown as traps that use the skill when monsters move near them.
W		Template:Str	Template:Int	150%	Increases elemental damage dealt by weapons.