[MegaBlues]

@Spoops, as far as I'm aware, Execute is the most expensive base class skill at 34 FP, and has a damage scaling of 150% SWA + 25% missing HP. Another base class skill which requires elemental attack for its bonus and is subject to unmatched casting tool penalties shouldn't approach that cost. Even Execute is too expensive for what it does and the fact that it requires and cures Knockdown.

Also, Evoker objectively does less damage than Hexer with its spells. Aside from invocations, both classes use 100% SWA, while Hexer, aside from Wretched Oil, uses 70% Dark and ETC scaling while Evoker bounces between 100% and 140% at best. However, Hexer's skills often hit in a larger AoE for comparable costs (At Rank 5. Evoker's costs both go up and down while Hexer's go down exclusively, which is dumb.) The fact that Hexer spells always use 70% Dark ATK means that it's much easier to use all of them to effect, but Evoker's single-stat scaling means that you have to exclusively build for that one stat. The flipside is that Hexers are much easier to resist, but the fact is that Hexers have nigh-guaranteed infliction chances with innate status effects, while having comparable damage to Evokers. That's a balancing issue.

And Priest has 100% SWA and 70/70% Light/Lightning for Holy Spark, and 140% Light with Shine Ray. As well as good old healing, and a method to negate Light resistance.

And for the most part, Invocations have an inferior Momentum to Damage ratio than plain spells, with the same 100% SWA with an extra 40% Elemental scaling, unless you spend SP to increase the damage.