The Arm of Vengeance is a prosthetic made of solidified darkness, powered by hate, desperation, and rage. It is obtained through a ritual using a quarterstaff, a willing creature that is missing a limb, and demon blood. Tendrils of darkness bind the quarterstaff to that creature and it shifts to become a functioning limb, replacing the missing one. It is cool to the touch and does not assume wielder's body temperature.
The arm has 10 charges. You can use an action to expend 1 or more of its charges to cast one of the following spells from it, using your spell save DC or ranged spell attack: fire bolt (1 charge), burning hands (1 charge), or fire shield (4 charges).
The arm regains 1d6 + 4 expended charges after a long rest. If you expend the last charge, roll a d20. On a 1, the arm hardens, then crumbles into cinders and is destroyed.
Additionally, if you drop below 10 HP, as a reaction you can cast fireball, centered on yourself. You automatically fail the save, and the arm explodes and is destroyed.
Notes: Prosthetic must be attached to the wielder., Combat, evocation
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