CreamCloud0
Legend
yeah it's sort of six of one, half a dozen of the other, the associations of both do have their own threads of logic, but i personally at least see the possibility of magicked water naturally being super cold or something to thematically justify water spells dealing cold damage better than spontaneous lightning generation happening with all air based damaging spells (as few and far between as they are).I believe that originates in 3e where damage types were starting to matter more, and the main damage types for magic were fire, cold, electricity, and acid. Sonic damage existed but had something of a special status because sonic damage was particularly good at destroying objects (IIRC, doing full damage instead of half and also ignoring Hardness), and as such were relegated to highly specialized spells that mostly didn't do as much damage. So as you say, fire = fire and water = cold are fairly easy, as is air = electricity. So earth became acid more or less by default.
Personally, I think the association of air to lightning/electricity by way of storms is far stronger than the association of water to cold by way of ice. Ice is a result of cold acting on water, not really an inherent water thing IMO. But that's a matter of taste.






