Thermal Void
Consuming Brain Freeze has a 100% chance to cause your next Ice Lance to Shatter 4 additional stacks of Freezing.
Tree position
In the Frost Mage talent tree, Thermal Void 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 Thermal Void from Improved Flurry and Freezing Winds.
Improved FlurryFlurry fires 1 additional missiles.
Freezing WindsShattering enemies inside your Blizzard increases Shatter's area damage by 15%.
Same row
Also on this row: Glaciate and Comet Storm.

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