• Spark of Hope
• Item Level 219Disenchants into:
  [Abyss Crystal]: 1-2
• Binds when picked up
• Unique
• Trinket
• +100 Spirit
• Requires Level 80
• Equip: Reduces the mana cost of your spells by 42.
• Sell Price: 11 39 40

Source

This item can be found inside Cache of Living Stone after defeating Kologarn in the 10-man version of Ulduar.

Patch changes

•  Patch 3.1.0 (2009-04-14): Added.
  

External links

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