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• Mark of the Illidari
• Item Level 70Disenchants into:
  Not disenchantable
• "Bears the mark of Illidan. This item can be turned in at the Scryers or Aldor bank in Shattrath City."

Mark of the Illidari can be exchanged for flasks whose usage is restricted to raid instances.

Source

This item drops from trash mobs in World of Warcraft: The Burning Crusade raid instances: Serpentshrine Cavern, Tempest Keep, Black Temple, Battle of Mount Hyjal and Sunwell Plateau.

Notes

To exchange this item for a flask, players must have exalted reputation with the Aldor or Scryers, the Sha'tar, and the Cenarion Expedition.

Gives:

•  [Shattrath Flask of Fortification]
•  [Shattrath Flask of Mighty Restoration]
•  [Shattrath Flask of Relentless Assault]
•  [Shattrath Flask of Supreme Power]
•  [Shattrath Flask of Blinding Light]
•  [Shattrath Flask of Pure Death]

Patches and hotfixes

Patch 2.1.0 (22-May-2007): Added 

External links

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