Reverberation

From WoW: IncGamers World of Warcraft Wiki

Talent: Reverberation
Effect: Reduces the cooldown of your Shock spells.
Statistics: Rank 1 = -0.2 sec, Rank 2 = -0.4 sec, Rank 3 = -0.6 sec, Rank 4 = -0.8 sec, Rank 5 = -1 sec.