The Invulnerable Coat of Arn

[Havard]

I believe that most of the artificats are from Gary's Greyhawk campaign. I'm not sure about the Invulnerable Coat.

It could still be created by Gary, but perhaps as a tribute to Dave.

OTOH, I have a theory about another artifact, the Orbs of Dragonkind, that they were inspired by Dave's adventure in The City of Father Dragon. OTOH, as this adventure was rather late in Dave's campaign, it is also possible that he used the item from Supplement III.

-Havard