[quote=Rayn Night]
Why would the rain stop a fire though xD The heat will evaporate the drop before it does anything to it. Think of a Pyromancer as being two of the three elements needed to start the Fire: Fuel and Ignition :P Pyromancers would probably have a hard in places where the air is thin with oxygen.For the question of Salty. I would have to say you could probably create your own source of water, but would take much more energy than if you already had a source of water to play with. It would be the same for a Pyromancer. If there is no fire or no fuel for fire in the area, it is safe to say they can still use their magic but would require more energy and concentration.
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Or... You could carry a few water skins for emergency water...