Strength

Strength is the quality or state of being physically strong and substance to withstand great force or pressure. Strength grows the chest, increasing  Melee Damage,  Health, and  Tenacity.

This is the Warrior's and Paladin's main stat. All classes can benefit from Strength due to the durability it provides. Strength also increases  Melee Range, although not as much as  Agility.

Interestingly Strength also increases  Projectile Speed. Making it offensively useful for the Mage and other casting Classes.

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