add water level 3 spells

spells/Water3.tex

+
+\spell{Desert Ghosts}% Name
+  {\mWater}% Spheres
+  {Wane}% Action
+  {\duplicated, \detailed}% Enhancements
+  {low temperature}% Resist with
+  {\spellArea\ \arabic{spellArea} barrels' worth of water evaporate, and turn into ghastly apparitions with distorted features.  Ranged attacks take a -\arabic{spelllevel} penalty.}% Description
+  {
+    The caster banishes the water with a `begone', and it evaporates.
+    The mist forms ghostly aparitions which impede vision.
+    Ranged attacks and some Vigilance checks take a minus \arabic{spelllevel} penalty.
+
+  When cast on acidic creatures, the spell inflicts \rollConv\ Damage.
+    }
+