Efficacy Support

Efficacy Support is support gem that grants more spell damage, more damage over time, and increased skill effect duration.

Skill functions and interactions
The 3 modifiers, and  are independent from each other so that 1 skill may benefit from only 1 modifier, but another skill may benefits from all 3 modifiers.


 * This stack additively with and multiply with 's mod.


 * This mod multiplicative with other more damage multiplier. Since the stat_id behind this mod is, while the other more damage, for example from , is  . Read Stat for details.

Related modifiers
The following modifiers are related to Efficacy Support:

Related unique items
The following unique items are related to Efficacy Support:

Version history

 * Now requires level 8 at gem level 1 (from 31).
 * Now causes supported skills to deal 10% more damage over time at gem level 1 (from 15%), up to 24% at gem level 20 (no change).
 * Efficacy Support is now offered to the Witch for completing The Caged Brute, and can be purchased from Nessa by the Templar, Shadow and Scion.


 * Now has alternative gem quality.


 * Efficacy Support now correctly supports Damage over Time effects.


 * Introduced to the game.
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