Soulshatter

Soulshatter is a spell which reduces aggro on all targets within 50 yards by 90%.

Tips and tactics
Soulshatter is best used in conjunction with a party or raid running KLHThreatMeter (a.k.a., KTM) or Omen. This way, the warlock can raise their threat to just over the main tank's, then use Soulshatter to drastically lower it. Soulshatter is more effective when used late in a boss fight rather than early due to the amount of threat built up during the fight.