Custom Formula Damage (lvl, mlvl) Question

[wa$yll'dbk]

Hello, I would ask more experienced users what I must do to make sd like this formula? I using tfs for 8.6. This is possible to do it as spell with calculations lvl and mlvl?

local combat = createCombatObject()
setCombatParam(combat, COMBAT_PARAM_TARGETCASTERORTOPMOST, true)
setCombatParam(combat0_Brush, COMBAT_PARAM_EFFECT, CONST_ME_MORTAREA)
setCombatParam(combat0_Brush, COMBAT_PARAM_DISTANCEEFFECT, CONST_ANI_SUDDENDEATH)
setCombatParam(combat0_Brush, COMBAT_PARAM_TYPE, COMBAT_DEATHDAMAGE)

local level = getPlayerLevel(cid)
local maglevel = getPlayerMagLevel(cid)

function Dmg(cid, level, maglevel)
    return (level*2+maglevel*3*1-30)*-1,(level*2+maglevel*3*1)*-1
end

setCombatFormula(combat, CALLBACK_PARAM_LEVELMAGICVALUE, Dmg)

function onCastSpell(cid, var)
    return doCombat(combat,cid,var)
end