Primary Attributes

Strength

Effects overall damage and damage output.
Most effectively utilized by Berserker, Warrior and Ranger classes.

Agility

Effects attack speed and evasion.
Most effectively utilized by Berserker, Assassin, and ranger classes.

Dexterity

Effects overall damage, attack speed, physical attack, magic attack, and magic defense.
Most effectively utilized by Assassin, Monk, Ranger classes.

Intelligence

Effects magic damage, magic defense, and mana pool.
Most effectively utilized by Mage, Necromancer, Spiritualist classes.

Vitality

Converts to overall health, physical defense, and magic defense.
Most effectively utilizes by Warrior, Monk, and berserker classes.

Luck

Increased Crit chance.
Increased Fortune (chance of item drops to be of higher rarity. Does not increase chance of crystal drops)