Stamina (STA)
Increases Health points.

Intellect (INT)
Increases the rate at which you learn weapon skills.
Increases your Mana points.
Increases your chance to score a critical hit with spells.

Spirit (SPT)
Increases health and mana regeneration. Spirit affects all characters' mana and hit point regeneration rates in and out of combat.

Weapons
Attack (AR) - Attack Rating.
Power (AP) - Attack Power.
Damage (DMG) - Weapon Damage.

Armor
Defense (AC) - Defense Rating.
Armor - Physical Damage Reduction.
Other Information
DPS for the Rogue and Hunter: Agility contributes to 50% of the DPS for Rogues and Hunters *and Strength contributes* to the other 50%.

Critical Hit for all classes: Agility will enhance the chance to score a critical melee hit for all melee classes (critical spell damage is determined by Intelligence).

DPS for all classes except Rogue & Hunter: Strength will contribute to 100% of the DPS for all classes other than Rogues and Hunters.