Mobius's Arm Canon (5e Equipment)

Wondrous item, rare (requires attunement) This device replaces the user's arm, allowing them a prosthetic limb which shoots radiant blasts. When you attune to the Arm Cannon, you are considered proficient in unarmed strikes and Radiant Blasts using it. Swap Modes. As a bonus action, this prosthetic arm can swap between being a cannon and an arm. Radiant Blast. Once per turn, in place of an attack, you may make a ranged weapon attack against a creature of your choice within range (120/500). On a hit, the target takes 4d6 radiant damage, and the next attack roll made against this target before the end of your next turn has advantage, thanks to the mystical dim light glittering on the target until then.

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