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 EffectMagnified EffectAoE Tier: 1 Level: 1 Cost & Reservation Multiplier: 120%Supports any skill with an area of effect, making it larger.Supported Skills have 40% more 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 copies of the same Support Gem socketed at the same time.
VitalityVitalityBuff, Persistent Tier: 1 Level: 1Supports Persistent Buff Skills, causing you to gain Life Regeneration while the Skill is active.Regenerate 1% of 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 copies of the same Support Gem socketed at the same time.
II
Coming Soon
SplinterSplinterTier: 2 Level: 1Supports Skills that Hit Enemies, causing those Hits to Break Armour based on a portion of Physical Damage dealt.Break Armour equal to 15% of Physical Damage dealt by Supported SkillPlace into a Skill's Support Gem socket in the Skills Panel to apply its effects to that Skill. You cannot have multiple copies of the same Support Gem socketed at the same time.
III
Astral ProjectionAstral ProjectionTier: 3 Level: 1Supports 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 35% 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 copies of the same Support Gem socketed at the same time.
CannibalismCannibalismBuff, Persistent Tier: 3 Level: 1 Cost: 15 SpiritSupports Persistent Buff Skills, causing you to recover Life on kill while the Skill is active.4% of Life recovered on Kill 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 copies of the same Support Gem socketed at the same time.
Item acquisition
Plague Bearer has restrictions on where or how it can drop.