Picking spells for an ancient red dragon, I wonder if the Armor spell would function. It has no effect on "a person already armored" (AD&D revised 1stEd) but is a dragon considered to be armored?
closed as unclear what you're asking by SevenSidedDie Feb 27 '18 at 5:03
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It would improve the AC of the red dragon by 1 until dispelled by magic or damage. The spell specifies:
if it is cast upon a creature with an armor class normally better than 9 (due to its size, speed, skin, etc.) it will benefit the normal armor class by one step
This is from the Armor spell first specified in AD&D 1e UA.