Shadow Limb (Arm)

Whether through a bargain made by powerful beings, or a curse brought by the fey, a limb on your body has permanently been removed from your body and replaced with the power of the shadows. 

 Shadow Limb. Once this feat is chosen, you must choose a limb on our body. By using a free action, you can summon the shadow limb. This limb acts just as your normal limb and follows the usual laws of physics as your original limb. The new takes on the appearance of solid darkness, customized to the player's liking or the DM's discretion. Your senses through the limb are numbed but not nullified. This limb can react and move just as your original limb. The limb disappears if you drop to 0 HP, are asleep, or are rendered unconscious. 

• If the chosen limb is an arm, your melee attacks now count as magical for the purpose of overcoming resistance and immunity to nonmagical attacks and damage. You must have the shadow arm active to hold a weapon with 2 hands. You cannot wear magic items that require two hands. When the limb makes contact with a creature that is undead, you can feel a sensation of cold vibrations through the shadow arm. While touching a creature you have advantage on Perception skill checks to know if a creature is undead.
• If the chosen limb is a leg, your ranged attacks now count as magical for the purpose of overcoming resistance and immunity to nonmagical attacks and damage. You must have the shadow leg active during combat or your movement is halved. You cannot use magic items that is required to be worn on the feet. Your shadow leg can feel the cold vibrations that magically radiate from undead creatures, you gain advantage when using your Perception skill checks to sense undead creatures within 60ft of you.

Shadow Duplicate. As a bonus action, you are able to "detach" your shadow limb and cast it 10 feet away. The rest of your shadow will form around the limb to create a shadowy duplicate of yourself that you can use to distract another creature. This distraction can cause the a creature to become flanked, giving you or an ally advantage on their next attack. This shadow duplicate has the same stats as you. The shadow duplicate has 1 HP borrowed from your current HP. Once the shadow duplicate has taken damage, it disappears and returns to your body resulting in you losing the borrowed HP. You may use a portion of your movement speed to command the duplicate to move at a maximum of 10 ft from your position.  The shadow ignores difficult terrain. The shadow duplicate cannot take actions. You can spend a bonus action to dismiss the shadow and return it to your body, regaining the borrowed 1 HP. This ability has a number of uses equal to your current level. You cannot use this ability if you only have 1 HP. The shadow duplicate will disappear if your Hp drops to 0, are asleep, or rendered unconscious.