Comes down to the number of runes you have and how you play your mage.
As a mage, I always prioritize other skills, such as Neatness, the spell schools, Transmute, High Magic, Anger, and a few others. Don't forget Summoner which will boost your royal griffin summoning ability.
If I use royal griffins and/or dragons, I really like to have Voice of the Dragon, but usually don't have the spare runes until late mid-game. Too many other skills are higher priority to me. Especially since I don't consider the prerequisite skills I have to take to get to Voice of the Dragon especially useful.
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