Way of Dark
Arcane Mastery - Further charge your Magic Bolt for increased size and damage.
A bit longer cast time but well worth it, Arcane Mastery will allow you to get more out of your Charge Attack, Magic Bolt. This should prove an adequate casting spell, so pair it up with a nice, quick instant cast secondary ability. If you're in a team, consider Summon Skeleton as your secondary ability; but know that you will need some protecting.
Leads to: Sadist or Eldritch