• Arcanum of the Defender
• Item Level 70Disenchants into:
  Not disenchantable
• Binds when picked up
• Requires Level 70
• Requires Keepers of Time - Revered
• Use: Permanently adds 16 parry rating and 17 dodge rating to a head slot item. Does not stack with other enchantments for the selected equipment slot.
• 1 Charges
• Sell Price: 25
• Vendor 100

Source

This item is a reputation reward; you must be Revered with Keepers of Time to purchase it for 100 (before reputation discount) from Alurmi <Keepers of Time Quartermaster> in Tanaris.

Patch changes

/ Patch 3.0.2 (14-Oct-2008): Renamed "Arcanum" (was "Glyph") to not confuse with Inscription glyphs. 

External links

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