Shadow Word: Void

Shadow Word: Void is a level 15 Shadow priest talent that replaces Mind Blast.

Functionality
Essentially an upgraded Mind Blast, Shadow Word: Void features the following in comparison:
 * A second charge
 * A larger spell power co-efficient (130% vs 120%)
 * Higher Insanity generation (15 vs 12)

These bonuses come at the cost of the recharge period being 1.5s longer than Mind Blast's cooldown (before Haste).