Arcane Subtlety

Arcane Subtlety is a Mage talent that grants Dispel resistance while reducing the threat caused by Arcane spells. It is a very useful talent for arcane mages across both PvE and PvP as it offer multiple benefits simultaneously.

Uses

 * Dispel resistance is invaluable in PvP situations, specially for a class as reliant on buffs as the Mage. It can prevent both your buffs and the dots you place from being dispelled, protecting from Purge, Dispel, Mass Dispel, Spellsteal and others of the sort.
 * Mages have many critical dispellable abilities such as Icy Veins, Ice Barrier, Ice Block (via Priest's Mass Dispel) and Mana Shield (original) (and even Presence of Mind if one is not careful), and this talent provides accessible protection to these for Mages across all trees.
 * The threat reduction is excellent for mages that use Arcane spells as a primary damage source in raids. 40% threat reduction to Arcane spells is the most that a Mage can obtain through talents, with Frost and Fire talents reducing threat of those schools by only 10%.
 * This talent is available early in the Arcane tree, and is often taken by Frost or Fire Mages who want some useful early Arcane talents, such as Arcane Concentration, Improved Counterspell, or Presence of Mind. Since Frost and Fire mages will not be using Arcane Missiles as often, this talent is preferred over Improved Arcane Missiles in the first tier.  The threat reduction is very useful when using Arcane Explosion in AoE situations, where a tank needs to hold aggro on multiple mobs.