Pode ser também que a speel esteja errada, peguei 1 spell qualquer aqui testa ai 
Nao entendi mt bem essa spell sua então peguei 1 spell e edita pra que ela só seja usada dentro da agua, o resto vc adapta 
local WATER_TILES = {1370,1371,1372,1773,9466,1378, 4718, 6628, 6630, 4664, 5739, 4614, 4615, 4616, 4617, 4618, 4619, 4608, 4609, 4610, 4611, 4612, 4613, 7236, 4614, 4615, 4616, 4617, 4618, 4619, 4620, 4621, 4622, 4623, 4624, 4625, 4665, 4666, 4820, 4821, 4822, 4823, 4824, 4825}
local mana = 1
local combat = createCombatObject()
setCombatParam(combat, COMBAT_PARAM_TYPE, COMBAT_PHYSICALDAMAGE)
setCombatParam(combat, COMBAT_PARAM_EFFECT, CONST_ME_POFF)
setCombatFormula(combat, COMBAT_FORMULA_LEVELMAGIC, 1500, 1500, 1500, 1500)
local arr = {
{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
{0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0},
{0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0},
{0, 0, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 0, 0},
{0, 0, 0, 0, 0, 1, 1, 2, 1, 1, 0, 0, 0, 0, 0},
{0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0},
{0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0},
{0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0},
{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
}
local area = createCombatArea(arr)
setCombatArea(combat, area)
function onCastSpell(cid, var)
return doCombat(cid, combat, var)
end
if not isInArray(WATER_TILES, getThingfromPos(pos)) then
return doPlayerSendTextMessage(cid, 20, "Vc não pode usar essa magia fora da agua.")
end