Just a quick lesson for the Warlocks: Incinerate.

The warlock's direct damage spell (one target spell) Incinerate is acquired at level 64 under the Destruction talent tree. Since Heavy Destruction builds (x/x/41+) are perfect for PvP and PvE, this spell is pretty nifty since it has less cast time.

How do you make full use of this spell? At level 64, Incinerate deals around 300 to 400 Fire damage at a mana cost of 325. To deal more damage, cast Immolate first which adds an additional 89 to 104 Fire damage. That buffs up the damage enough to make it at par with Shadowbolt at less cast time. At level 70, damage goes up to approximately 400 to 500 with an additional 100 to 130 Fire damage from Immolate.

It gets bonus effects from Devastation, Ruin and Backlash. This would really be useful against shadow resistant mobs and opponents with shadow resistant armor.