This chart shows effective Ability Efficiency for channeled abilities.

Modifies the Energy cost of Warframe abilities. The minimum Energy cost is 1/4 of the Base value.

—In-game Description

Ability Efficiency linearly affects the energy cost of Warframe abilities. All Warframes have a base Ability Efficiency of 100%; Ability Efficiency over 100% indicates a reduction of ability cost while Ability Efficiency below 100% indicates an increase in ability cost. The Arsenal will not display an Ability Efficiency above 175% because abilities cannot consume less than 25% of their base costs.

$ \text{Final Ability Cost}=\text{Ability Cost} * Max((200%-\text{Ability Efficiency}), 25%) $

Channeled abilities drain energy at a specified rate. Ability Efficiency affects the energy drained at each tick as expected, but because Ability Duration affects the amount of time between these ticks, the formula for effective Ability Efficiency for channeled abilities is as follows:

$ \text{Final Energy Drain}=\text{Energy Drain} * Max((\frac{200%-\text{Ability Efficiency}}{\text{Ability Duration}}), 25%) $

In the case of Ability Duration under 100%, Ability Efficiency above 175% is also taken into account, even though not depicted in the Upgrade-Menu. The final drain still cannot go below 25% of its base value. (See the graph on the right for examples.)

The in-game energy bar display is rounded down to the nearest whole number, but the costs of the abilities are not. This results in the discrepancies in the apparent cost of abilities with Ability Efficiency mods. For example, an ability with 25 energy base cost will cost 17.5 energy with maxed Streamline (+30%). If this ability is used multiple times in a row, it will appear to cost 18 energy, then 17 energy, then 18 energy, then 17 energy and so on.

Energy Drain for Toggled AbilitiesEdit

Some abilities are toggled on and last until the user turns them off or runs out of energy, such as HildrynIcon272 Hildryn's Haven130xDark Haven or ChromaIcon272 Chroma's SpectralScream130xDark Spectral Scream. Energy drain for these toggled abilities depends on both Ability Efficiency as well as Ability Duration. See the related section for a full explanation.


Mod TT 20pxStreamline, Mod TT 20pxFleeting Expertise, Mod TT 20pxBlind Rage, the Arcane Enhancement PaxBolt64x Pax Bolt, and the positive Ability Efficiency Arcane Helmets stack additively. Stacking with Trinity Meridian Helmet or Ash Scorpion Helmet does not appear to follow this formula; this suggests stacking is different when you have a helmet that reduces Ability Efficiency.


Mod TT 20pxFleeting Expertise, Mod TT 20pxStreamline, and Mod TT 20pxSystem Reroute reduce ability costs linearly based on the percentage shown on the mod card. Mod TT 20pxBlind Rage, instead, increases ability costs.


PaxBolt64x Pax Bolt is currently the only Arcane Enhancement that affects Ability Efficiency.

Arcane HelmetsEdit

Arcane Helmets also reduce (or increase) ability costs linearly based on the percentage shown on the helmet. The following helmets affect Ability Efficiency:

See alsoEdit

Start a Discussion Discussions about Ability Efficiency

  • Blind Rage

    3 messages
    • Strenght goes up , yay . Efficiancy goes down , ow that hurts . You know that already . Clear your mod board , now place blind rage on , the ...
    • wrote:'''Why is there no example of final ability cost if you use blind rage''' They are trying...
  • If I were a scientist...

    • Issac Newton's law of power... I tried to make sense of this but im not the kid from goodwill hunting
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