Comet Storm
Casting Ray of Frost replaces your Ray of Frost with Comet Storm, calling down a series of 7 icy comets on and around the target, that deals up to Frost damage to all enemies of its impacts. Each Comet Shatters 1 stacks of Freezing.
Tree position
In the Frost Mage talent tree, Comet Storm sits in the Frost specialization talents, row 10 of 11. It is a single-point node. Its row opens once 20 points are spent in Frost Talents.
Connected above
The tree draws a line into Comet Storm from Hailstones and Glacial Chill or Glacial Shatter.
HailstonesThe time it takes to generate an Icicle is reduced by 1.1 sec.
Glacial ChillGlacial Spike deals 5% increased damage and applies 2 additional stacks of Freezing.
Glacial ShatterGlacial Spike no longer applies Freezing, and instead Shatters 5 stacks of Freezing.
Same row
Also on this row: Thermal Void and Glaciate.
Thermal VoidConsuming Brain Freeze has a 100% chance to cause your next Ice Lance to Shatter 4 additional stacks of Freezing.

Talent trees
Comet Storm is in the talent tree of 3 specializations. Mage: Arcane (DPS), Fire (DPS), Frost (DPS).
Comet Storm Changes by patch
Tracked changes to this talent between game data builds, newest first.
- First tracked in the game data (patch 12.1.0)