It magically grows with the user's size, but can only grow during a long rest, and when no one is watching it, but it grows in very faint amounts unless withheld from growing, in which case it will instantly form new material to match the other arm's size, or the assumed size that the other arm should be proportionally if that arm is missing. The shoulder can extend two inches further than a normal arm, and is made of strong metal, allowing for quite the intense metal punch. (1d4+dexterity or strength modifier+Proficiency+1 once initially attuned.)
The arm gives a +1 to Ac due to the magic of the arm.
The arm can glow with a mostly controllable magma or fire colored glow between the parts. Upon looking inside when it is bright there seem to be red hot metal gears and sometimes even fire inside, though this does not harm the arm in any way. Unless a powerful magical dispel is used on the arm within 6 seconds before hitting the arm it can not be damaged unless the wielder wishes it to be. There are not many arms like this one in the world, this is quite rare, and most would assume crafted by a fine inventor or the wielder.
The arm can cast Heat Metal once per day (Recharging at dawn), heating both the arm and what it touches. The arm takes no damage from this, neither does the wielder. The arm gains 1d6 fire damage to all attacks made with it's weapon until the end of it's next turn.
The arm can cast Scorching Ray, however the wielder must be in a deep emotional state, whatever that may be. (Rage, anguish, contempt, hatred, sadness, etc.) the emotion must drive the character to attack. This does not have a limited number of uses, though there is a cool-down of one turn (if this is used then the wielder may not use it again until after their next turn).
The arm also has the ability to cast Alter Self, Fabricate, Shape Stone, Fireball. the arm has 4 charges and they reset at dawn.
Alter Self - 4 charges
Fabricate - 1 charge
Shape Stone - 2 charges
Fireball - 4 charges
Notes: Bonus: Armor Class, The arm must be attached where the wielders original arm was and you must spend a longs rests worth of time getting use to the arm.
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