:lol:
You could try using ointment against fire ... I think Auralia has something like that ...
Plus : Keep moving !
Anything fire-related might be good as well ... But I don't know about the Water Dragon's resistances against fire.
Regarding ranged weapons : You can build your own specialized arrows and ... what's the word ? We say "Bolzen" for the "arrows" of crossbows ... dict.leo.org translates that into several words, "spikes", for example, and I don't know whicjh one is right ?
Well, anyway, you can build poison arrows, fire arrows and arrows with additional damage - and that for crossbows, too !
Additionally you can use "debuff"-spells on the Water Dragon ... the "LIghtning Find You!" is the most basic of these spells - one that imho *any* person capable of magic should have !