(3) Set: Reduces the threat generated by your Scorch, Arcane Missiles, Fireball, and Frostbolt spells. (5) Set: Increases the radius of Arcane Explosion, Flamestrike, and Blizzard by 25%. (8) Set: 10% chance after casting Arcane Missiles, Fireball, or Frostbolt that your next spell with a casting time under 10 seconds cast instantly.
Patch 1.7.0 (13-Sep-2005): The free mana cost buff provided by the Mage's Netherwind armor set is now called "Netherwind Focus" and will be noted in your combat log.
Patch 1.5.0 (2005-06-07): Statistics, effects, and set bonuses updated.