Arcane magic is really the amazing one – for example you can teleport to any playable place on the map. Beyond that you have a magic rune that explodes but does not hurt your teammates, and also pushes enemies back, so you can save someone if he will be surrounded. The most powerful spell right now – arcane shield allows you to create a huge magic shield that can defend you from any threat during some limited amount of time.
Arcane magicians also have faster mana regeneration and bigger general amount of it. The successful basic spell hit gives bigger mana bonus.