• Mirror of Truth
• Item Level 200Disenchants into:
  [Abyss Crystal]: 1
• Binds when picked up
• Unique
• Trinket
• Requires Level 80
• Equip: Improves critical strike rating by 84.
  Equip: Chance on melee and ranged critical strike to increase your attack power by 1000 for 10 secs.
• Vendor 40

Source

This item can be purchased in Dalaran for 40 from:

•  Arcanist Ivrenne <Emblem of Heroism Quartermaster>
•  Magistrix Lambriesse <Emblem of Heroism Quartermaster>
•  Debbi Moore <Trinkets & Charms>

External links

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