Your Swiftness stat determines how quick you are during combat. This stat increases your movement speed as well as attack speed and Lost Ark Gold also reduces the duration of your cooldowns of your class's skills.
It is the Endurance stat is key to your defense and health, making it a vital character stat in the tank world to put first. Endurance can boost your physical and magical defense, and also the efficacy of shields and healing.
The Expertise stat dramatically alters the way Debuffs effect you and your opponents. Expertise extends the duration of Debuffs if they are cast on opponents and increases the impact from Stagger effects. It also reduces the duration of the Debuffs used on you.
Each Specialization skill is specific to your specific class. Any abilities, class skills specific types, or different kinds of damage can be improved by the addition of points to Specialization. For example, Points of Specialization for the Paladin sub-class improve the effectiveness that you can use Holy Aura, the rate you increase your Piety meter and the damage that comes from Awakening Buy Lost Ark Gold. Look over the Specialization area of your Character Profile to see how it affects your particular class.