This is more of a gripe of FFXII I have, though I'm certain other FF games are guilty of this as well.
Every game has their elemental system, and by and large these elements are fairly well represented with spells, elemental weapons and so on. But then sometimes there are a few odd elements that exist, but don't really fit anywhere. They're present and can be useful, but you're not really given many resources to actually utilize that element.
FFXII is probably the best example of this. Water magic which was heavily prominent in the FFX series, was reduced one tier I magic spell, a few weapons, and a water mote, and a summon.
FFXIII had water magic again, but for some reason removed it entirely in FFXIII-2.
Earth magic has worse luck. Featured pretty prominently in FFVII, in FFXII it had a pole, a rod, an ammo and a quiver of arrows to its name. And a summon. That is not much to work with. FFXIII has an equally barren way to deal Earth damage: the TP skill Quake.
I don't really get why they would go through the trouble of including an entire element in the game and don't really give you the tools to actually use them.