So , you ' re just whiffing on a lot of things here . If you assume the skill , at 3 linked supports , is at 100 %, then you assume the supports account for 40 % more damage , then that skill with 5 linked supports is 180 %, right ? So if you have it 3 linked , with another 3 linked spell that has 20 % damage , that ' s 180 %, right ? And that ' s not considering the possibility probability that the second spell is casting more than once . We don ' t know the scaling on this , but whether it ' s scaling the damage reduction perhaps into a damage bonus at some point , or the cast frequency , you ' re still going to come out ahead , assuming you can find two skills worth casting together . If they give the Channel tag to Flameblast which they probably should , then it ' s not hard to make a FlameblastFirestorm combo that synergizes well . If you ' re stacking physical damage and poison , Blade Flurry and any of the physical spells should work well , and such a setup could also work exceptionally well for a variation of the old Elemental Buzzsaw builds . The purpose of supports like this isn ' t necessarily to be something you ' re instantly going to slot into builds and be awesome . They stated when they released Slower Projectiles that they knew some builds didn ' t really care about the projectile speed , and would use it , but they wanted to see what people would come up with that actually used the slower speed . It ' s not like the superslow Ball Lightning builds are tearing up the world , but the fact that such builds exist and function is value enough . It ' s a PvE game . Not everything has to be about optimal clear speed . Edit From Bex ' s post below , you get frequency as it levels apparently . 01 s per level and 1 % damage per 1 % quality .