Spell formula damage

[Ward_214]

Can anyone help with explaining the damage formula on the spells and attack runes(Ex below: Sudden Death Rune)

local combat = createCombatObject()
setCombatParam(combat, COMBAT_PARAM_TARGETCASTERORTOPMOST, true)
setCombatParam(combat, COMBAT_PARAM_TYPE, COMBAT_DEATHDAMAGE)
setCombatParam(combat, COMBAT_PARAM_EFFECT, CONST_ME_MORTAREA)
setCombatParam(combat, COMBAT_PARAM_DISTANCEEFFECT, CONST_ANI_SUDDENDEATH)
setCombatFormula(combat, COMBAT_FORMULA_LEVELMAGIC, -1, -60, -1, -60, 5, 5, 20, 20)

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

How does the numbers add up? (-1, -60, -1, -60, 5, 5, 20, 20)

 

[Ward_214]

B
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m
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!
!
!

 

[Cykotitan]

//setCombatFormula(combat, type, mina, minb, maxa, maxb[, minl, maxl[, minm, maxm[, minc[, maxc]]]])

combat = combat
type = COMBAT_FORMULA_LEVELMAGIC
mina = -1
minb = -60
maxa = -1
maxb = -60
minl = 5
maxl = 5
minm = 20
maxm = 20

min = (int32_t)((player->getLevel() / minl + player->getMagicLevel() * minm) * 1. * mina + minb);
max = (int32_t)((player->getLevel() / maxl + player->getMagicLevel() * maxm) * 1. * maxa + maxb);