The Invulnerable Coat of Arn

[Havard]

THE INVULNERABLE COAT OF ARN
This relic of a bygone age is a shining coat of chainmail. It covers the chest and abdomen and will fit any humanoid-type regardless of size. It renders the areas protected completely invulnerable to physical attacks, protects the wearer from spells like +5 armor, from fire like a ring of fire resistance and from the effects of acid, cold and disease totally. It also has two powers from TABLE I. one from TABLE IV, and one from TABLE III.

Suggested powers:
TABLE I: IJ, IP
TABLE III: III D
TABLE IV: IV G

Actual powers:

The above is taken from D&D Supplement III: Eldritch Wizardry (1976) p 40. A tribute to Arneson? Taken from Dave's campaign? The Ring of Gaxx is another item from the same book so...

-Havard