Intellect

Intellect is a Primary Stat that increases your maximum mana points, and the power of your spells (each point of Intellect gives half a point of Magic Attack). It is most useful if you are planning on using mostly magic-based spells.

In addition, Intellect increases the speed at which you recover mana points while not in combat slightly, as well as the Critical Strike rate of your spells. A spell that critically strikes deals / heals 50% additional damage.