lvl * -1.4
mininum
-1.9
maximun
setCombatFormula(combat, COMBAT_FORMULA_LEVELMAGIC, -1.4, 0, -1.9, 0)
Third and fourth numbers are 0, that means that this is based only on lvl and ml, if you are lvl 100 with ml 100 you will hit:
0 + 140 + 190 = 330 mininum damage and
0 + 140 + 190 = 330...