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
Armour Demolisher IArmour Demolisher ISupport, Spell Category: Armour Demolisher Tier: 1Support Requirements: +5 StrSupports any skill, causing Armour Break it inflicts to be stronger.Supported Skills Break 50% more ArmourPlace 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.
Prolonged Duration IProlonged Duration ISupport, Duration Category: Prolonged Duration Tier: 1 Cost & Reservation Multiplier: 120%Support Requirements: +5 StrSupports any skill that has a duration, making that duration longer.Supported Skills have 30% more Skill Effect DurationPlace 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
Mysticism IMysticism ISupport, Buff, Persistent Category: Mysticism Tier: 2 Additional Reservation: 15 SpiritSupport Requirements: +5 IntSupports PersistentBuff Skills, causing you to deal increased Spell Damage while on full Energy Shield while the Supported Skill is active.Deal 30% increased Spell Damage while on full Energy Shield 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.
Upwelling IUpwelling ISupport, Buff, Persistent Category: Upwellling Tier: 2 Additional Reservation: 15 SpiritSupport Requirements: +5 IntSupports PersistentBuff Skills, causing your Minions to deal increased Damage while you are not on full Mana while the Supported Skill is active.Your Minions deal 30% increased Damage while you are not on full Mana 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
Armour Demolisher IIArmour Demolisher IISupport, Spell Category: Armour Demolisher Tier: 3Support Requirements: +5 StrSupports any skill, causing Armour Break it inflicts to be stronger.Supported Skills Break 70% more ArmourPlace 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.
Prolonged Duration IIProlonged Duration IISupport, Duration Category: Prolonged Duration Tier: 3 Cost & Reservation Multiplier: 120%Support Requirements: +5 StrSupports any skill that has a duration, making that duration longer.Supported Skills have 35% more Skill Effect DurationPlace 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
Clarity IIClarity IISupport, Buff, Persistent Category: Clarity Tier: 4 Additional Reservation: 20 SpiritSupport Requirements: +5 IntSupports PersistentBuff Skills, causing you to gain increased Mana Regeneration while the Skill is active.50% Increased Mana Regeneration Rate 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.
Upwelling IIUpwelling IISupport, Buff, Persistent Category: Upwellling Tier: 4 Additional Reservation: 30 SpiritSupport Requirements: +5 IntSupports PersistentBuff Skills, causing your Minions to deal increased Damage while you are not on full Mana while the Supported Skill is active.Your Minions deal 50% increased Damage while you are not on full Mana 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
Chaos MasteryChaos MasterySupport, Chaos Category: Mastery Tier: 5Support Requirements: +5 IntSupports Chaos skills, granting them an additional level. Does not support skills which do not have levels.+1 to Level of Supported Chaos 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
Ravenous Swarm has restrictions on where or how it can drop.