solar stump
While the four we have and their respective abilities are interesting with the possible synergies already available, why not have a "tanky" utility element in the form of ice? Possible abilities could include armor that provides a temporary health buffer to self or allies, a large aoe similar to "Doll" from Voodoo in the form of a slightly damaging blizzard that slows, maybe even be the element that allows temporary constructs like ice pillars that can be shot at to explode and slow enemies in an area, or provide a "safe" platform from which to shoot from?
#Ice as a possible element
fading mountain
There are two more elements teased coming down the pike so maybe one of those will be something like that 👀
vernal fossil
ooo yes ice, I am ice magic enthusiast, love those things, could do many things. (tbh my first thought about this game is "Alas there is no Ice" and then I just play it anyway lol) you could freeze the enemies and then not deal with them
it's also pretty fun to think of combo, with fire it might explode (temperature difference and stuffs) or melt and then the water would increase electric damage, etc. not sure how it'd combo with acid though. maybe freezing the puddle and the geyser which can then be destroyed for more puddles and ice shards