Wondrous Item, rare
An Arcane prosthesis that replaces an arm on the body of the user. While this arm is on your body it feels like your missing arm including pain. A spell is carved into the arm to allow the user to function as though no arm is missing.
Adamantine- an arm piece of Adamantine provides a +1 to AC. In addition when hit with a critical the arms host rolls a D20 and on a 18-20 the critical becomes a normal hit.
Spell Enchanted- this arm is enchanted with a spell determined at the time of creation. A spell of 4th level or higher will increase the rarity of the arm. This spell has one use that recharges on long rest.
Notes: Bonus: Armor Class, Utility, Wristwear, Handwear
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