TwoSix
Everyone's literal second-favorite poster
Pathfinder Kineticist wouldn't be a bad place to look for inspiration on this sort of idea. That class is elemental themed, and mechanically much like the 3.5 Warlock (a progressive damage ranged blast, and multiple at-will use talents revolving around its elemental theme).An Elementalist class could have a sub-class for each classic element, maybe plus wood & metal. Each could have a focused set of magical powers (and thematically related proficiencies) using its element without all the hassle of prepping & casting spells, tracking slots, optimizing a build or the like. Just blast things with fire, or lightning, or heal with the comforting power of water or protect with the solidity of earth & stone... and off you go.