Arcane lightning rod arm

You must be missing an arm or hand to use this magic item. To attune to this item, you must attach it to your arm at the wrist, elbow, or shoulder, at which point the prosthetic magically forms a copy of the appendage it’s replacing.

While attached, the prosthetic provides these benefits:

• The prosthetic is a fully capable part of your body.
• You can take an action to remove the prosthetic, and it removes itself if your attunement to it ends. It can’t be removed against your will.
• The prosthetic has 6 charges and regains 1 d4 charges every dawn
• When hit by a damaging spell the wearer can use a reaction to absorb part of the spell granting resistance to the spells damage and gaining charges equal to half the spells level to a minimum of one.
• When the wearer hits with a weapon attack using a weapon wielded in the hand of the prosthetic the wearer can expend charges to deal and additional 1 d4 lightning damage per charge.

Notes: creature missing a hand or an arm