Glyph of Conflagrate

A great glyph for Destruction warlocks who have specced Conflagrate. With this Glyph applied to their spellbook, the spell no longer consumes Immolate or Shadowflame. The glyph allows the caster to use Conflagrate twice during the duration of a single Immolate spell and leaves the DoT to run it's course for extra damage.

Source
This item is created with Inscription (375).

Tips and Tricks
Cast Immolate, follow up with an Incinerate (or Chaos Bolt if specced for it), and then cast Conflagrate as the spell is on its way. The result is that both spells will strike at the same time for a massive burst of damage which is usually more than enough to kill non-elite mobs, and even if they don't die, the dots you have on the target will finish the job shortly.

If you have Backdraft as well, a 40 point Destruction talent, casting Conflagrate immediately after achieving an Immolate or Shadowflame DoT on the target is best in order to gain the 10-30% reduction in cast and global cooldown time on your Destruction spells.