Mage · talent ability, from Arcane Blast

Arcane Blast

384per cast

Rank 5 · level 60 · before talents

Arcane Blast

15% of base mana30 yd range

2.5 sec cast

Blasts the target with energy, dealing 385 to 445 Arcane damage. Each time you cast Arcane Blast, the damage of all your other spells is increased by 10% and the mana cost of Arcane Blast is increased by 175%. Effect stacks up to 4 times and lasts 8 sec or until any other damage spell is cast.

Talents that change it, each at full ranks:

Arcane Power · with Arcane Power active +115 Shatter · against Frozen targets +94.6 Arcane Instability +17.4 Arcane Focus +12.0 Arcane Impact +11.3 Incineration +11.3 Arcane Mind +6.5 Presence of Mind · with Presence of Mind active per second +102 Arcane Concentration per 100 mana +23.4

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.