I've always been fascinated by the different uses of water as tools and weapons in media and real life. I'd like some water spells, like a hydraulic cutter (a jet of water coming out at really high pressure) or something like a huge ball of water that can be thrown at people. You ever belly flopped from the high diving board at the pool? Now imagine how that'd feel 10x higher and faster. That's what I'm thinking. Some flavor text about it being magically charged could easily justify it being storm damage, so no extra damage types needed. And from a roleplay perspective, having access to clean drinking water whenever would be extremely useful, especially on the frontier.