Mage · talent ability, from Blast Wave

Blast Wave

480per cast

Rank 5 · level 60 · before talents

Blast Wave

545 Mana

Instant45 sec cooldown

A wave of flame radiates outward from the caster, damaging all enemies caught within the blast for 464 to 545 Fire damage, and Dazing them for 50% reduced movement speed for 6 sec.

Talents that change it, each at full ranks:

Arcane Power · with Arcane Power active +144 Shatter · against Frozen targets +118 Improved Scorch · estimate: 5 Fire Vulnerability stacks +72.1 Fire Power +48.0 Arcane Instability +21.7 Elemental Precision +15.0 Critical Mass +14.2 Ignite +8.5 Arcane Mind +0.5 Arcane Concentration per 100 mana +9.8 Master of Elements per 100 mana +0.8

Averages, counting crits and misses, with a typical weapon and no other gear or buffs, against a target your level. Talents at level 60. Worked out from the game's own data, the same way as the Foresight addon.