This item is not able to grant new spells.
The +void that is grants works towards the spells effectiveness (and I think may also have something to do with mana consumption). I know this becuase at lvl 45 my void is maxed at 45 and I have +10 from items. This would put my void skill up to lvl 55, however I still do not have my lvl 46 bolt spell (I am lvl 45).
You have to train to get spells.