I think the fourth line should not be ‟Voice wielding power”, but instead ‟Voice-wielding power”. In Dragonborn lyrics there are words ‟And the voice, he did wield, on that glorious field”. (By the way, are the commas correctly placed? I would write it as ‟And the voice he did wield on that glorious field”.)
Doesn't this line mean ‟the power of wielding Voice (Thu'um)”? There were others capable of using Voice, but it took very long time to master it. For the Dragonborn it's natural and I think it's about the power of wielding Voice, not the Voice which wields power.