Agility

Agility is the ability to rapidly change body direction, accelerate, or decelerate. Pumping Agility lengthens limbs, increasing reach and speed.

This is the Hunter's and Rogue's main stat. All classes can benefit from Agility due to the bonus  Move Speed,  Jump Force, and  Dodge it provides. Agility is an important stat for melee as it increases  Attack Speed and  Melee Range.

Interestingly Agility also increases  Cast Rate. Making it especially useful for the Mage and other casting Classes.

Agility will make for a larger target, which is a minor drawback.