local combat = Combat()
combat:setParameter(COMBAT_PARAM_TYPE, COMBAT_PHYSICALDAMAGE)
combat:setParameter(COMBAT_PARAM_EFFECT, CONST_ME_HITAREA)
combat:setParameter(COMBAT_PARAM_DISTANCEEFFECT, CONST_ANI_ETHEREALSPEAR)
combat:setParameter(COMBAT_PARAM_BLOCKARMOR, 1)

function onGetFormulaValues(player, attack, factor)
    local skillTotal = 2 * player:getEffectiveSkillLevel(SKILL_DISTANCE)
    local levelTotal = player:getLevel() / 5
    return -(((skillTotal + attack / 2500) * 2.30) + (levelTotal) + 7), -(((skillTotal + attack / 1875) * 3.30) + (levelTotal) + 13)
end

combat:setCallback(CALLBACK_PARAM_SKILLVALUE, "onGetFormulaValues")

function onCastSpell(creature, var)
    return combat:execute(creature, var)
end