Dragon issue #365 features Bazaar of the Bizarre: Ashardalon’s Hoard.  The article features almost 40 new magical treasures of all types including weapons, armor, and wondrous items. 

The items presented here include some of the more famous treasures recovered from his lair at one time or another. Of these items, many Ashardalon seized during his life, but most are the leavings of those adventurers who sought to test their mettle against the beast . . . but were found wanting.

One particularly interesting one is the Dragonscale Shield:

Power (Daily): Immediate Interrupt. Use this power when you are in the area of a blast attack. One ally in the area gains cover against the attack.
Level 29: All allies in the area gain cover.