Rune not work

[sibbe]

I want this mana rune to give hp instead of mana.

local combat = createCombatObject()
setCombatParam(combat, COMBAT_PARAM_EFFECT, CONST_ME_MAGIC_BLUE)
setCombatParam(combat, COMBAT_PARAM_TARGETCASTERORTOPMOST, 1)
setCombatParam(combat, COMBAT_PARAM_AGGRESSIVE, 0)

function onCastSpell(cid, var)
local mana = math.random(75, 125)
doPlayerAddMana(cid, mana)
doSendAnimatedText(getPlayerPosition(cid), '+' .. mana, TEXTCOLOR_LIGHTBLUE)
return doCombat(cid, combat, var)
end

I've tried to change "mana" to "health" and "life" but then I can't use the rune.

 

[chojrak]

local combat = createCombatObject()
setCombatParam(combat, COMBAT_PARAM_TYPE, COMBAT_HEALING)
setCombatParam(combat, COMBAT_PARAM_EFFECT, CONST_ME_MAGIC_BLUE)
setCombatParam(combat, COMBAT_PARAM_AGGRESSIVE, false)
setCombatParam(combat, COMBAT_PARAM_TARGETCASTERORTOPMOST, true)
setCombatParam(combat, COMBAT_PARAM_DISPEL, CONDITION_PARALYZE)

local heal = {min = 250, max = 500}
function getSpellDamage(cid, weaponSkill, weaponAttack, attackStrength)
	return heal.min, heal.max
end
setCombatCallback(combat, CALLBACK_PARAM_SKILLVALUE, "getSpellDamage") 

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