2020

• Glyph of Ice Block
• Item Level 25Disenchants into:
  Not disenchantable
• Major Glyph
• Classes: Mage
• Requires Level 25
• Use: Permanently teaches you this glyph.
  When Ice Block terminates, it triggers an instant free Frost Nova and makes you immune to all spells for 3 sec.
• Sell Price: 1

Source

This item is created with Inscription (225).

Materials needed

3x [Celestial Ink]

1x [Light Parchment]

Patch changes

• Patch 5.0.4 (28 August 2012): Changed from Your Frost Nova cooldown is now reset every time you use Ice Block. 
  
• / Patch 3.0.2 (14-Oct-2008): Added. 
  

External links

• Battle.net (EU)
• Wowhead
• Thottbot
• WoWDB