Talk:Valkyr (Warframe)/@comment-26835408-20151002211115/@comment-94.68.85.36-20151003163421

I'll explain how things work because you are wrong at some points

First of all, there are 2 seperate calculations on the final cost, first is the reduction from efficiency, then from duration

Efficiency works like E.Cost = cost*(1-efficiency)

Duration is FinalCost = E.Cost/(1+duration)

Examples: Streamline and continuity (30% eff + 30% dur) would reduce EPS to 2.5*(1-0.3) = 1.75, 1.75/(1+0.3) = 1.35~ which you can confirm by yourself at your arsenal

In the case of Fleeting Expertice you get 2.5*(0.4) = 1 and then 1/(1+(-0.6))  = 2.5 back to the final cost

NEGATIVE DURATION IS HELL

-60% duration makes the cost x2.5 (Cost/0.4)

In fact you can just put the 2 formulas in one, but i'm comfortable with 2

It would be (Cost*(1-efficinecy))/(1+duration)