The original 2nd Edition entry from the Forge.

This Armor is found in many different types; the most common being Plate Armor and Chainmail. These magnificent suits of armor where orginally the creation of a combined effort of Dwarven Craftsmen and Elven Mages. The effect has since been duplicated by many mages and craftsmen.

These Suits usually have a Armor Class bonus of +2 to +4. The most magnificent feature of these suits of armor, is their ability to confer magic resitance upon the wearer. The magic resistance is equal to 15% base +5% per level of the individual. While mages can wear the armor, they are totally unable to cast spells. Clerics who can where metal armor may still cast spells while wearing this armor. The armor has no effects on any other magic items worn or used by the wearer. Elven versions of this armor typically have the move silently bonuses of Elven Chain Mail although the wearer is still unable to cast magic.