• Arcane Charges
• Item Level 70Disenchants into:
  Not disenchantable
• Quest Item
• Unique
• Requires Level 70
• Use: Drops arcane charges over a demon in the Dead Scar.
• Cooldown: 1 sec

Source

Arcane Charges are provided for the following quests:

•  [70 Daily] Distraction at the Dead Scar†
•  [70 Daily] The Air Strikes Must Continue

Patches and hotfixes

Patch 2.4.0 (25-Mar-2008): Added 
Patch 2.4.2 (2008-05-13): Arcane Charges now deal arcane damage. 

External links

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