Empyreans have the best skill set (well to many people), they get free Specialized Arcane lore. It saves you 6 skill credits for other things.
Void magic is a new type of magic. It is kind of like both life and war. It has a Nether Bolt/Arc/Ring that does NETHER damage. It also has curse spells like corruption, weakness, destruction and corrosion.
When using a void mage you don't have to use different wands for every monster. It will do less damage than war, but the curses really help out in fellowship fighting and can be good for solo as well.
For example, you can hit a monster with a corrosion spell and it will do 360 points of damage over a period of 15 seconds, so while the monster might not go down right away, once you have hit the spell if it has less than 360 points of health you can just leave it and it will die.
Here check out this link:
http://ac.wikkii.net/wiki/Void_Magic