Here it is:
local combat = createCombatObject()
setCombatParam(combat, COMBAT_PARAM_TYPE, COMBAT_PHYSICALDAMAGE)
setCombatParam(combat, COMBAT_PARAM_EFFECT, CONST_ME_MORTAREA)
setCombatFormula(combat, COMBAT_FORMULA_LEVELMAGIC, -1.3, -30, -1.7, 0)
function onCastSpell(cid, var)
return...