• Crystal Yield
• Item Level 55Disenchants into:
  Not disenchantable
• Binds when picked up
• Use: Decreases an enemy target's Armor by 200 for 2 min.
• 1 Charges
• Sell Price: 10

Source

This item is a quest reward from  [53] Crystal Yield^ω τ ϖ.

Patch changes

Patch 1.3.0 (07-Mar-2005): Modified Crystal Charge, Crystal Force, Crystal Restore, Crystal Spire, Crystal Ward, and Crystal Yield to be on appropriate cooldown timers. Completing the Crystal Pylon quest to obtain them will now reward five each instead of three. 

External links

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