O script é o mesmo que você tem, basta remover esta linha que está marcado em preto
 
	 
 
	local combat = Combat() 
	combat:setParameter(COMBAT_PARAM_EFFECT, CONST_ME_MAGIC_BLUE) 
	combat:setParameter(COMBAT_PARAM_AGGRESSIVE, 0)
 
	function onCastSpell(creature, var) 
	    local condition = Condition(CONDITION_MANASHIELD) 
	    condition:setParameter(CONDITION_PARAM_TICKS, 180000) 
	    local player = creature:getPlayer() 
	    if player then 
	        condition:setParameter(CONDITION_PARAM_MANASHIELD, math.min(player:getMaxMana(), 300 + 7.6 * player:getLevel() + 7 * player:getMagicLevel())) 
	    end 
	    creature:addCondition(condition) 
	    return combat:execute(creature, var) 
	end
 
	 
 
	queda assim
 
	 
 
local combat = Combat()
combat:setParameter(COMBAT_PARAM_EFFECT, CONST_ME_MAGIC_BLUE)
combat:setParameter(COMBAT_PARAM_AGGRESSIVE, 0)
function onCastSpell(creature, var)
	local condition = Condition(CONDITION_MANASHIELD)
	condition:setParameter(CONDITION_PARAM_TICKS, 180000)
	creature:addCondition(condition)
	return combat:execute(creature, var)
end