This finely crafted mechanical arm replaces a missing limb. Forged from steel, brass, and alchemically tempered alloys, it channels both mechanical precision and arcane energy. Known as Automail, it fuses the arts of invention and alchemy into one.
Base Features
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Prosthetic Replacement. This arm replaces a missing limb and functions as a normal arm and hand. It cannot be easily removed without tools or effort.
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Enhanced Unarmed Strikes. When you make an unarmed strike using this arm, you deal 1d6 bludgeoning damage instead of normal damage. This attack counts as both magical and as a weapon for Artificer Infusions.
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Integrated Tool. Choose smith’s tools, thieves’ tools, or alchemist’s supplies when you attune to the arm. You can use that tool as if you were holding it, even if your hands are full.
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Durable Construction. You gain a +1 bonus to AC against slashing or bludgeoning damage from nonmagical attacks, representing the arm’s metal plating.
Alchemical Pulse (1/Short Rest)
As a bonus action, you can channel your alchemical energy through the arm to unleash a pulse of transmutation power.
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Make a melee spell attack against one creature within 5 feet.
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On a hit, the target takes 2d8 force or thunder damage (your choice).
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On a miss, the target still takes half as much damage (minimum 1).
This ability recharges when you finish a short or long rest.
Infusion Conduit
If you infuse this arm with your Artificer Infusions, it can hold two Infusions simultaneously, but only one can be active at a time. You can switch which infusion is active as a bonus action, once per long rest.
Maintenance
The arm requires one hour of maintenance per day. If you skip upkeep, the arm becomes stiff and less responsive (you have disadvantage on Dexterity checks involving that arm until repaired during a short rest).
Upgrades (Optional)
| Tier | Rarity | Level | Benefits |
|---|---|---|---|
| Basic Automail | Uncommon | 3+ | As above |
| Advanced Automail | Rare | 9+ | +1 to attack/damage rolls made with unarmed strikes using the arm; resistance to lightning damage |
| Fullmetal Arm | Very Rare | 15+ | +2 to attack/damage rolls; once per long rest, cast Thunderwave (3rd level) or Shatter as part of an attack |
Forged from pain, pride, and progress, the Automail Arm is both a burden and a symbol — a reminder of the cost of creation.
Notes: Melee Weapon Attack: Bludgeoning, As a bonus action, you can channel your alchemical energy through the arm to unleash a pulse of transmutation power. -Make a melee spell attack against one creature within 5 feet. -On a hit, the target takes 2d8 force or thunder damage (your choice). -On a miss, the target still takes half as much damage (minimum 1)., This arm replaces a missing limb and functions as a normal arm and hand. It cannot be easily removed without tools or effort.
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