Frozen Rune

Frozen Rune is no longer in the game. It was a tradeable item, that was used in crafting the Argent Dawn frost resistance items.

Source
Frozen Rune is no longer available since the level 60 version of Naxxramas was removed from the game in Patch 3.0.2. It was obtained from an interactable object of the same name on the walls of boss chambers. Each object would yield between three and six runes. It required a Word of Thawing to be looted.

As an ingredient
Frozen Rune was used in the following recipes:


 * Blacksmithing
 * Icebane Bracers
 * Icebane Breastplate
 * Icebane Gauntlets


 * Leatherworking
 * Icy Scale Bracers
 * Icy Scale Breastplate
 * Icy Scale Gauntlets
 * Polar Bracers
 * Polar Gloves
 * Polar Tunic


 * Tailoring
 * Glacial Gloves
 * Glacial Vest
 * Glacial Wrists
 * Glacial Cloak

As a quest objective
These quests were only available after completing