Arcanomechanical Prosthetic Arm

This Prosthetic Arm is used as your normal arm, but with some upgraded from the previous arm that you had.
Having an arm like this is expensive, especially if you are growing up with the multiple changes of your body is facing, and not everybody knows the humanoid/creatures anatomy enough to know how to reattach limbs and connecting nervous tissue and also know the arcane arts to make such wondrous item like this one.

This arm has 4 parts:

• The first part is the connection to the nerves that is surgically attached to the side of the chest where the shoulder should be starting, this connects to the nerves directly and attaching a new arm is always painful procedure.
• The second part is the upper arm, which is normally to use to contain a small dagger or a pack of rolled tobacco but nothing bigger.
• The third part as three slots to store cantrips, the user can choose up to three cantrips and can switch between other cantrips if he has a crystal with a cantrip store. The process of putting a spell in a proper cristal is sometimes tenues and has its difficulties, the player needs to roll a DC 15 with his Spellcasting ability, on a 1 the crystal breaks. The default cantrips are Minor Illusion, Control Flames, Prestidigitation.
• The fourth part is the hand that is modular.
  On the palm of the hand or back of it, not both, you have one crystal that can use a cantrip just like the crystals in the lower arm. The [spell]Light[spell] spell you can use it directly on the crystal and the light is projected towards the opposite side of the hand.
  You can also have fingers is detachable and each one of them can have one kind of use. The player can between these finger modules (can only select up to five fingers):
  • Lockpick - a lock pick comes out and of the finger and you can use it as part of your thieve's tools.
  • Liquid dropper - if you speak the command word the finger produces up to 1 gallon of a liquid of your choice.
  • Lighter - a small flame is created, it produces a dim light up to 5 feet. The lighter needs new charges for every 30 minutes of continued use.
  • Small knife - it's a small knife that its use to cut small things like a piece of food or carve a small piece of wood.
  • Spell storing - you can store one spell of level 1 to be in the finger to be used on a later moment after the spell is cast from the finger you cannot cast it again, and the finger is considered empty so you can store another spell. If you put another spell in a finger that already has a spell stored the first spell disappears without affect and it is replaced with the new spell. The finger must be connected to the hand at all times or it will lose the stored spell
  • Diamond tipped - this finger has a diamond tip where you can use it to cut glass or use as an improvised weapon if you have the five fingers with diamond tips you can consider it as a claw attack, which you can use to make unarmed strikes. If you hit with them, you deal slashing damage equal to 1d4 + your Strength modifier, instead of the bludgeoning damage normal for an unarmed strike.

Changing a crystal or part of the arm requires one action of combat to detached and a bonus action to attach a new one.

Due to the magical nature of the prosthetic limb, the magic can be dispelled by the means of the spell dispel magic rendering it unable to perform correctly but can be fixed if you spend a short rest imbuing magic into again.
You also can use a coating spell mechanism that protects your limb to be dispelled or targeted spells. The coating itself protects it for 5th level spells or lower and it costs an additional 500gp to the arm and for each level higher than 5th is an additional 100gp.

This limb was designed to fit in one creature only. If by any chance you try to put the part of the limb on another connection that is not the one it was designed for, the most likely thing to happen it is to malfunction and cannot attune to the new limb that was just attached. With this said, there are temporary arms that are used between fixing a prosthetic limb, this prosthesis does not have any function besides being used as a temporary limb, any skill used while wearing it that is dexterity or strength-based is with disadvantage because you are not used to it and the limb itself its meant to only do light work, such as writing, or carry something light.

Notes: Damage: Slashing, Utility, Wristwear, Handwear, Artificer