Attrition
While active, causes you to deal more Hit damage to Rare and Unique enemies the longer you've been fighting them, and gain Culling Strike against them once you've been fighting them for long enough.
Very solid choice with strong damage or utility for most builds.
Gem Effects
You have Culling Strike against Rare and Unique enemies that have been in your Presence for a total of at least (40-31) seconds
You deal 1% more Hit damage to Rare and Unique enemies for every 2 seconds they have ever been in your Presence, up to (40-59)%
Requirements
Best Support Gems for Attrition
Ranked by synergy — the game won't tell you which combo deals the most damage
How to Use Attrition Effectively
Practical tips you won't find on the tooltip
Gem Level Priority
Level this gem to 20 ASAP — base damage scales significantly with gem level. Every level matters.
Attribute Planning
Requires 86 Str at max level. Plan your passive tree and gear to meet this — don't get stuck unable to level your main skill.
Alternatives to Attrition
Similar skills — which one fits your build better?
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How to Get Attrition
Use an Uncut Skill Gem to obtain Attrition. These drop from enemies or can be purchased from the gem vendor once unlocked through the campaign.