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Meta
Meta Gems
Tooltip
Meta Gems are Skill Gems that can use, Trigger, or otherwise apply the effects of other Skill Gems. Skill Gems and Support Gems can be socketed into them interchangeably, though most Meta Gems require at least one Skill Gem to be socketed to function.
Meta skills are those that allow you to socket other active skills as support gems. These are often referred to as Trigger skills, although not all trigger skills are meta skills.
Support gems socketed in a meta gem will support the active skills socketed in the same gem.