The following support gems are recommendations by GGG as listed in-game, and do not necessarily reflect optimal combinations or the views of the wiki.
Gem tier
Support gems
I
Magnified Area IMagnified Area ISupport, AoE Tier: 1 Cost & Reservation Multiplier: 130%Support Requirements: +5 IntSupports any skill with an area of effect, making it larger.Supported Skills have 35% increased Area of EffectPlace into a Skill's Support Gem socket in the Skills Panel to apply its effects to that Skill. You cannot have multiple Support Gems of the same Category socketed within one Skill.
Vitality IVitality ISupport, Buff, Persistent Tier: 1 Reservation: 20 spiritSupport Requirements: +5 StrSupports PersistentBuff Skills, causing you to gain Life Regeneration while the Skill is active.Regenerate 1% of maximum Life per second while a Supported Skill is activePlace into a Skill's Support Gem socket in the Skills Panel to apply its effects to that Skill. You cannot have multiple Support Gems of the same Category socketed within one Skill.
II
Herbalism IHerbalism ISupport, Buff, Persistent Tier: 2 Reservation: 15 spiritSupport Requirements: +5 StrSupports PersistentBuff Skills, causing you to gain increased Life recovery from Flasks while the Skill is active.30% Increased Recovery from Life Flasks while a Supported Skill is activePlace into a Skill's Support Gem socket in the Skills Panel to apply its effects to that Skill. You cannot have multiple Support Gems of the same Category socketed within one Skill.
Thornskin IThornskin ISupport, Buff, Persistent Tier: 2 Reservation: 20 spiritSupport Requirements: +5 StrSupports PersistentBuff Skills, causing you to deal increased Thorns Damage while the Supported Skill is active.Deal 40% increased Thorns Damage while a Supported Skill is activePlace into a Skill's Support Gem socket in the Skills Panel to apply its effects to that Skill. You cannot have multiple Support Gems of the same Category socketed within one Skill.
III
Astral ProjectionAstral ProjectionSupport Tier: 3Support Requirements: +5 IntSupports Nova Skills, causing those Skills to take place at the targeted location when used instead of around you.Supported Skills Cast at the targeted location instead of around you Supported Skills have 25% less Area of EffectPlace into a Skill's Support Gem socket in the Skills Panel to apply its effects to that Skill. You cannot have multiple Support Gems of the same Category socketed within one Skill.
Cool HeadedCool HeadedSupport, Buff, Persistent Tier: 3 Reservation: 15 spiritSupport Requirements: +5 StrSupports PersistentBuff Skills, causing Ignite applied to you to last for a shorter duration while the Supported Skill is active.50% less Ignite duration on you while a Supported Skill is activePlace into a Skill's Support Gem socket in the Skills Panel to apply its effects to that Skill. You cannot have multiple Support Gems of the same Category socketed within one Skill.
IV
Herbalism IIHerbalism IISupport, Buff, Persistent Tier: 4 Reservation: 30 spiritSupport Requirements: +5 StrSupports PersistentBuff Skills, causing you to gain increased Life recovery from Flasks while the Skill is active.50% Increased Recovery from Life Flasks while a Supported Skill is activePlace into a Skill's Support Gem socket in the Skills Panel to apply its effects to that Skill. You cannot have multiple Support Gems of the same Category socketed within one Skill.
Thornskin IIThornskin IISupport, Buff, Persistent Tier: 4 Reservation: 40 spiritSupport Requirements: +5 StrSupports PersistentBuff Skills, causing you to deal increased Thorns Damage while the Supported Skill is active.Deal 70% increased Thorns Damage while a Supported Skill is activePlace into a Skill's Support Gem socket in the Skills Panel to apply its effects to that Skill. You cannot have multiple Support Gems of the same Category socketed within one Skill.
V
Bleed IIIBleed IIISupport, Physical Tier: 5Support Requirements: +5 StrSupports any skill that Hits enemies, causing it to inflict Bleeding.Supported Skills have 100% chance to inflict BleedingPlace into a Skill's Support Gem socket in the Skills Panel to apply its effects to that Skill. You cannot have multiple Support Gems of the same Category socketed within one Skill.
Physical MasteryPhysical MasterySupport, Physical Tier: 5Support Requirements: +5 IntSupports Physical skills, granting them an additional level. Does not support skills which do not have levels.+1 to Level of Supported Physical SkillsPlace into a Skill's Support Gem socket in the Skills Panel to apply its effects to that Skill. You cannot have multiple Support Gems of the same Category socketed within one Skill.
Item acquisition
Iron Ward has restrictions on where or how it can drop.