Essa spell é igual a spell "Power Down" do wodbo, quem conhece entenderá, até

spells.xml

<instant name="Power Down" words="powerdown" manapercent="0" prem="0" aggressive="0" selftarget="1" exhaustion="1000" needlearn="0" script="support/power down.lua">

powerdown.lua

function onCastSpell(cid, var)
local mana = getCreatureMana(cid)

if doCreatureAddMana(cid, -mana) then
 if doPlayerAddSpentMana(cid, mana) then
  doSendMagicEffect(getCreaturePosition(cid), 14)
  return false
 else
  doCreatureAddMana(cid, mana)
 end
end

doSendMagicEffect(getCreaturePosition(cid), 2)
return false
end