Talk:Mesa (Warframe)/@comment-76.117.121.206-20151003165535/@comment-69.121.154.253-20151005073804

-50% duration and 50% efficiency only cancel themselves out when you don't consider any other mods. If you add Continuity to her after Fleeting Expertise for example, you end up with -30% duration and +60% efficiency. The power use for that is using 43% more energy from the duration alone but using 60% less energy because of the efficiency so it equals out to 57% of the total being used. If you were to only use Continuity alone you end up with still using 77% of the original energy cost. Duration does not scale the same as efficiency and both of them together make up your total energy usage. These multipliers together are similar to the way adding both +100 base damage from mods and +100% elemental damage mods together gives you more damage than just adding 200% of either one. Both of them are still necessary, unfortunately it takes more mod slots to max out efficiency now for these abilities.