• Blessed Weapon Coating
• Item Level 70Disenchants into:
  Not disenchantable
• Requires Level 70
• Use: While applied to target weapon, wielder has a chance to regain 165 mana on each spell cast. Only functions on the Isle of Quel'Danas, on the Magisters' Terrace, and on the Sunwell Plateau. Lasts for 1 hour.
• 5 Charges
• Sell Price: 15
• Cooldown: 1 Second

Source

This item is a quest reward from  [70 Daily] Ata'mal Armaments.

Patch changes

• Patch 2.4.0 (25-Mar-2008): Added. 
  

External links

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