Mages are ranged offensive spell casters.
All spells of the Mage, just like any other class, are cooldown based and take a certain amount of seconds to cooldown. The Mage also has a Mana bar which slowly generates after it's been depleted. When the Mage is at 100% mana, it can overcharge a spell. This will consume the entire mana bar, but the effectiveness will be greatly increased. To overcharge a spell, simply hold the shift key.
Yet to be documented.