this is the spell script

 

local combat = Combat()
combat:setParameter(COMBAT_PARAM_TYPE, COMBAT_PHYSICALDAMAGE)
combat:setParameter(COMBAT_PARAM_EFFECT, CONST_ME_GROUNDSHAKER)
combat:setParameter(COMBAT_PARAM_BLOCKARMOR, true)
combat:setParameter(COMBAT_PARAM_USECHARGES, true)
combat:setArea(createCombatArea(AREA_CIRCLE3X3))

function onGetFormulaValues(player, skill, attack, factor)
    local min = (player:getLevel() / 5) + (skill * attack * 0.04) + 10
    local max = (player:getLevel() / 5) + (skill * attack * 0.08) + 18
    return -min, -max
end

combat:setCallback(CALLBACK_PARAM_SKILLVALUE, "onGetFormulaValues")

local function castSpell(creatureId, variant, amount)
    local creature = Creature(creatureId)
    if creature then
        combat:execute(creature, variant)
        if amount > 1 then
            addEvent(castSpell, 500, creatureId, variant, amount - 1)
        end
    end
end

function onCastSpell(creature, variant)
    local creatureId = creature:getId()
    addEvent(castSpell, 0, creatureId, variant, 3)
    return true
end

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