Mage · spell

Blizzard

1,138per cast

Rank 6 · level 60 · before talents

Blizzard

1400 Mana30 yd range

Instant

Ice shards pelt the target area doing 1184 Frost damage over 8 sec.

Talents that change it, each at full ranks:

Arcane Power · with Arcane Power active +341 Shatter · against Frozen targets +280 Piercing Ice +68.3 Arcane Instability +51.5 Elemental Precision +35.6 Ice Shards +16.9 Arcane Mind +1.2 Frost Channeling per 100 mana +14.3 Arcane Concentration per 100 mana +9.0 Master of Elements per 100 mana +0.7

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.