• Purified Onyxia Blood Talisman
• Item Level 245Disenchants into:
  [Abyss Crystal]: 1-2
• Binds when picked up
• Trinket
• +15 Fire Resistance
• Requires Level 80
• Equip: Increases defense rating by 69.
  Equip: Increases your parry rating by 108.
  Equip: Restores 101 health per 5 sec.
• Sell Price: 4 60 30

Source

This item is obtained from the following quests:

•  [80] A Most Puzzling Circumstance
•  [80] A Most Puzzling Circumstance

Patch changes

• Patch 3.2.2 (2009-09-22): Added. 
  

External links

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