Steam Cannon

Rare

Martial ranged weapon, heavy, two-handed, 2d10 piercing damage, range 50, reload as move action (ammo: cannonballs)

Phlogiston Thrower

Rare

At-will, std, cone 5; inflicts 8d6 fire damage, plus half on turn start for 3 rds (ammo: phlogiston containers)

Lightning Gun

Rare

At-will, std, line 20; inflicts 6d8 lightning damage plus stun 1 rd (Con DC 16 negates).

Freeze Ray

Rare

At-will, std, range 10; subject is frozen (Con DC 16 ends), then chilled (-50% movement, disadvantage to Dex saves) (Con DC 16 ends)

Arcane Bomb

Rare

At-will, std, range 10, burst 2; inflicts 5d4+5 force damage to each target, and also dispels as the 3rd-level spell Dispel Magic (casting modifier +8). Note: not a launcher, just loose ammo, i.e. grenades.

Personal Shield Generator

Rare

Proficiency as a light shield or buckler. When activated, it generates a magical barrier, which provides +1 AC. Also, each time you are struck for damage (the attack must be comprised of matter or energy), you may spend 1 ammo to gain Resistance to that attack.

Rapid Relocator

Rare

Belt attachment. Devices senses imminent danger and activates dimensional folding algorithms, albeit with little time to calculate destination. Just prior to being hit by an attack or spell, wearer can spend 1 ammo to teleport to a random safe location within 8 squares (roll 1d8 for cardinal direction and another d8 for number of squares)

Cloaking Device

Rare

Cloak augment. When activated, the cloak projects an image to any onlooker of whatever is visible on your opposite side, making you effectively invisible, as the spell Greater Invisibility. Burns 1 ammo per round in which you move at more than 50% speed, or take any attack or cast a spell.

Tactical Analysis Unit

Rare

Visor/eye augment. When activated, it analyzes your attacker's strengths and weaknesses, and uses their body language to predict attacks before they occur. As an immediate action, you may spend 1 ammo to force disadvantage on an attacker, or to gain advantage to a saving throw.

Mass Modification Harness

Very Rare

This suit of armor otherwise functions as chain mail. However, when activated, it can be quite powerful indeed. It has the power to modify your mass by a factor of 50 in either direction, and can effect those changes at lightning speed. Thus, you might leap upward, decreasing your mass so that your leap takes you high into the sky, only to increase it as you fall down upon an enemy. There are a variety of uses, but here are a few:

• Train Punch: at-will, std, melee attack; you punch, and your fist hits with the momentum of a speeding train, inflicting 2d12+40 bludgeoning damage. Costs 1 ammo.
• Leap-and-crush: at-will, move and std; you leap up to 50 squares, and when you land, you inflict 4d12+60 bludgeoning damage on anyone in your target square, and a burst 2 for half that. To hit the exact square, roll a ranged attack against AC 10, with a -1 for every 5 squares you're traveling. If you miss, uses the grenadelike scatter chart from the Arcane Bomb. Costs 2 ammo.
• Absorb impact: at-will, immediate; upon being struck by a physical attack (made of matter or energy), you increase your mass significantly to better absorb it. You suffer only 20% of the damage. Costs 2 ammo.
• more TBD

Personal Tank

Very Rare

Vehicle. This vehicle is about the size of a standard wagon, and allows a single pilot to ride in it, fully enclosed. It moves at a speed of 40 feet per round (though, on a well-crafted road going straight, it can hit up to 30 mph), can pivot in place, and has the following traits:

• 200 hit points
• Hardness 10 (attacks inflicting less than 10 damage inflict 0 damage)
• Construct traits
• Narrow arrow-slit-like visors allow pilot to see surroundings, can shoot small ranged weapons (hand crossbow, pistol) through, can cast spells outward, and can only be hit himself with a called shot with a 90% miss chance.
• Squish: During move action, tank can drive over medium or smaller targets, inflicting 8d6 crushing damage (Dex DC 16 to avoid)
• Cannon: At-will, std, range 40, burst 3, consumes 1 ammo; 8d6 fire damage (Dex DC 18 half).
• Flame Jets: At-will, bonus, close burst 2, consumes 1 ammo; 4d6 fire damage plus push 2.
• Rocket Boost: At-will, bonus, consumes 1 ammo; movement speed is doubled for one round. Squish DC increased to 20.

Power Armor

Very Rare

Personal vehicle, medium size. I mean, it's an iron man suit, let's face it. mechanically, it operates more like a suit of armor, as you can use your own weapons and spells while wearing it.

• Has 150 of its own hit points. All attacks go to the suit, not you, until these hit points are exhausted. At 0 HP, it can still do all the stuff below.
• Grants AC 18
• Empower Melee: Immediate, augments a melee attack, granting +20 damage. Costs 1 ammo.
• Mana Boost: Bonus action once/rd, costs 1 ammo; you may cast any sorcerer spell up to 5th level. (In the hands of PCs, you choose 5 spells, one of each level, but as a DM, just do whatever. Maybe make a note of which spell each one has when you cast it.) When casting 1st-4th level spells, they are empowered to 5th level.
• Auto-Repair: Passive (can be toggled off). Each round, on turn start, armor is healed of 15 damage (costs 1 ammo).

Energy Pack

Very Rare

A compact reactor generating magical energy for the most powerful Artifice devices, this can take many forms, such as a heavy backpacks, a module installed in a vehicle, a load carried in a cart. Generally, it's too heavy for all but the strongest to carry alone for long. Energy Packs generate power in perpetuity, but they have a certain maximum capacity, and otherwise regenerate slowly. In other words, they're rechargable ammo batteries.

• A typical energy pack has a capacity of 25, and recharges with a long rest.

Arcane Engine

Legendary

A complex, heavy device, loaded with delicate and rare arcane components, which can, when supplied with adequate magical energy, duplicate magical effects at the direction of non-spellcaster. Of course, its complexity is such that only a master Artificer can direct it without chance of failure; anyone else has a 10% chance per spell level of a mishap.

• Cast Spell: At-will, costs 1 ammo per spell level; you duplicate any wizard or sorcerer spell. The required action to cast is the same as that spell. If your Artificer level is lower than the Wizard level required to cast, or if you are not an Artificer at all, you suffer a 10% chance per spell level of a mishap (yes, cantrips can't misfire). Otherwise, the spell goes off as if a wizard of your level cast it.
  • Mishaps: when a mishap occurs, roll 1d4:
    • 1- Arcane explosion: close burst 5, 10 force damage per spell level (Dex DC 18 half) plus push 5, plus the Arcane Engine is damaged and unusable until repaired by a master artificer. The spell is lost.
    • 2- Miscast: the spell is replaced with a different spell of the same level. The DM chooses the spell, and chooses how it is targeted, generally with the aim of thwarting the PCs.
    • 3- Infinite Loop: the spell works, but the engine is stuck casting the same spell over and over every round until its pack is expended.
    • 4- Internal Damage: the spell fails, and the internal workings are damaged such that the engine cannot cast that spell again. Requires a master artificer to fix.

Technological Terror

Legendary

A massive, hulking mechanical man. This huge construct can either operate at the direction of one holding its control harness (as an independent construct), or, said controller can climb inside its head, enjoying total protection from the outside world, directing its actions from within. Of course, such a powerful automaton is not easy to control, and only a master artificer can do so. A lesser artificer will be resisted by the automaton, as it cannot be the Maker if it lacks the Maker's skill.

• 500 hit points
• Gargantuan
• Construct traits
• Hardness 10
• Movement 50-ft
• Melee attacks: with one standard action, the Terror can attack with both fists (or held weapons, and with one stomp)
  • Fist: Range 10-20 ft; its fists extend on long pistons, smashing into their target(s) for 4d8+20 bludgeoning damage each, with a +12 bonus to hit. Can attack the same or different targets, but cannot target within 10-ft reach.
  • Stomp: Close burst 1; its leg pistons rapidly compress, then extend, causing damage from their explosive extension, as well as falling damage from the Terror itself. Inflicts 6d8+30 bludgeoning damage to everyone within 5 feet of the Terror.
• Bonus actions:
  • Arcane Missiles: At-will, bonus, range 20; fires 3 missiles, each targeting independently (but can focus on one target if desired). Missiles hit unerringly for 2d10+5 force damage. A Shield spell will block them, as will a Personal Shield Generator.
  • Consume Metal: At-will, bonus, 20-ft reach; the Terror grabs and consumes a nearby object made primarily of metal, healing it based on the object's size (Tiny: 10 hp, Small: 25 hp, Medium: 50 hp, Large: 100 hp, Huge: too large to eat, but can rip off 8 Large chunks)
  • Sound Blaster: At-will, bonus, 50-ft cone; the Terror does not typically speak, but it has a voice, which humans perceive as an incredibly loud, dissonant, metallic screech, that tends to disrupt crystalline bonds. Inflicts 6d6 sonic damage to all in area, and has the effect of a Shatter spell on objects.
  • Eye Lasers: At-will, bonus, two 40-ft rays; each ray inflicts 4d6 fire damage.