Netra Invocation

How does the effect work?

At maximum rank, each enemy hit by the Grimoire's Alternate Fire grants 4% Ability Efficiency for 20 seconds, with a cap of 15 stacks. The listed per-hit value scales with rank: 1% at rank 0, 3% at rank 2, and 4% at rank 3. The total depends on how many enemies the Alternate Fire hits, up to the stated stack limit; the listed value is a mod bonus, not a calculation of a particular Warframe's final efficiency.

When is it useful?

Its payoff depends on connecting Alternate Fire with several enemies and using abilities while the resulting stacks remain active. A single hit provides only one stack, while a larger group can build more at once. The effect lasts 20 seconds, so avoid treating it as a permanent bonus independent of hitting enemies.

Slot, polarity, and investment

This Rare standard Tome mod has Madurai polarity, base drain 10, and maximum rank 3. The listed rank-up steps cost 30/1,449, 60/2,898, and 120/5,796 Endo/Credits. Ranking it raises the per-enemy bonus from 1% at rank 0 to 4% at rank 3; prioritize ranks if you regularly build stacks and need the larger efficiency bonus. It is incompatible with Ris, Vome, and Xata Invocation, so it cannot be equipped alongside those named alternatives.

How does it compare, and where does it drop?

Ris Invocation grants Ability Duration per enemy hit, while Vome Invocation grants Ability Strength per hit; Xata Invocation instead grants Energy Regen per second per hit and has a 10-stack cap. Those effects serve different resource or ability priorities, and the listed incompatibility means these Invocation choices are alternatives for the same Tome setup. Netra Invocation is listed from Rotation C of Deimos/Munio Defense.

Limitations and tradeoffs

• The bonus requires Alternate Fire hits and expires after 20 seconds.
• Its benefit is Ability Efficiency rather than Duration, Strength, or Energy Regen; other Invocation effects are mutually excluded by the listed incompatibilities.