This spell adds another spell to both the mage's area damage and crowd control lists. It deals excellent damage, and the daze allows a mage to run clear and start another spell before the targets come back to full speed.
Notes and trivia
In Heroes of the StormRagnaros has a Blast Wave ability, but it functions differently as it can be cast on allies, detonates after a delay and until it detonates it gives a movement speed increase.
Patch 4.0.1(2010-10-12): Now a targeted ground-effect with a 40 yard range and 8 yard radius (previously a point blank area of effect with a 10 yard radius). Cooldown reduced from 30 to 15 sec. Knockback effect removed. Daze effect duration reduced from 6 seconds to 3 seconds.
Patch 3.3.0(2009-12-08): The mana cost of this talent has been significantly reduced.
Patch 3.0.3(2008-11-04): No longer receives double the intended critical strike bonus from Combustion.
Patch 3.0.2(2008-10-14): Added a knockback effect to the spell. Targets are now thrown between 10 and 15 yards away from the caster.
Patch 2.0.1(2006-12-05): Cooldown reduced from 45 seconds to 30 seconds.
Patch 1.11.0(2006-06-19): The bonus this spell receives from effects that increase spell damage has been increased.
Patch 1.9.0(2006-01-03): Will now show spell data in the talent page.
Patch 1.6.0(2005-07-12): Will now cause damage to targets immune to immobilizing effects.
Patch 1.3.0(2005-03-07): Damage radius fixed so damage properly extends to 10 yd.
Patch 0.9(2004-08-17): Training costs added to ranks.