The Inventor

Not every individual possessed of great intelligence is interested in the magics studied by Wizards, or the internal awakening of Psions. Some become great architects or merchants, others mathematicians or physicists. Others prefer the hands-on approach of crafting items of great complexity and versatility. These Inventors craft technological marvels that would only otherwise be possible with the use of magic; ingenious Inventions that range from grappling hooks to traps, or even to walking mechanical servants.

Inventions

At first level, you have a pool of Invention Points equal to your INT modifier + the number in the "Invention Points" column of the Inventor's Table. These points represent the mental taxation required to craft an item, as well as the effort required to monitor and maintain an Invention. You can use these points, along with Scrap and perhaps Clockwork Dynamos, to create unique items. A single Invention can have a maximum of INT modifier Invention Points invested in it, and you cannot create a new Invention while you have no remaining Points, nor can you create and Invention with more Points than you have remaining. When an Invention is destroyed, or when you break it down, you regain all Invention Points invested in it.

There are three kinds of Inventions: Gadget, Equipment, and Autonomous. At 1st level, you can only create Gadget and Equipment Inventions. Many parts of creating an Invention require an Invention Check, defined below. If an Invention calls for an attack roll or saving throw, unless otherwise stated, they are:

• Invention Attack Bonus: Your Intelligence Modifier + your Proficiency Bonus
• Invention Save DC: 8 + your Intelligence Modifier + your Proficiency Bonus
• Invention Check: Your Intelligence Modifier + your Proficiency Bonus

Gadget and Equipment Inventions require 2 hours of work to create for each 5 Scrap involved in their creation. You can work on Inventions during Short and Long Rests, tracking the time spent toward the total. At the end of this time, you must succeed on an Invention Check against a DC of 10 + the number of Invention Points invested in it. On a failure, the attempt is ruined, and half of the Scrap used in the attempt is rendered useless. Once created, an Invention cannot be modified; your choices are permanent until it is destroyed or broken down.

Inventor's Ingenuity

At second level, you learn to harness your mind in the midst of combat. Your wit, intelligence, and ability to think on the fly are represented by a pool of Ingenuity Points equal to your INT modifier. You regain all Ingenuity upon completing a Long Rest. You can spend an Ingenuity to:

• Gain Advantage on an Attack roll. You must spend your Ingenuity before the roll is made.
• Gain advantage on an Intelligence, Wisdom, or Charisma skill check, or any Tool check. You must spend your Ingenuity before the roll is made.
• For the next 10 minutes, you gain Proficiency with one weapon, or with shields.
• For the the next hour, gain Proficiency in one set of Artisan's Tools, Poisoner's Tools, or Thieves' Tools

Inventor's Focus

At 3rd level, you choose whether to focus on Alchemy, Black Powder, or Physics.

Ability Score Improvement

When you reach 4th level, and again at 8th, 12th, 16th, and 19th level, you can increase one ability score of your choice by 2, or you can increase two Ability Scores of your choice by 1, to a maximum of 20.

Clockwork Dynamo

At fifth level, you learn to craft Clockwork Dynamos, complex and powerful pieces of clockwork that can power or add features to a number of your other Inventions. When you gain this feature at level 5, you add 1 Clockwork Dynamo to your inventory. A Clockwork Dynamo requires 8 hours of work and 100 Scrap to create. After this, you must make a DC 12 Invention Check. On a failure, the attempt is ruined and half of the scrap is lost. A Clockwork Dynamo must be wound for minute to be useful, and stays wound for 24 hours, at which point it stops ticking and any Inventions it is installed in becomes inoperable until it is wound again. You cannot construct a Clockwork Dynamo if you already have a number of Clockwork Dynamos equal to your Intelligence modifier.

Versatile Craftsman

When you reach fifth level, you gain Proficiency in two Artisan’s Tools of your choice. At 9th level, you gain Proficiency in two more.

Autonomous Inventions

By the time you've reached sixth level, you've learned to craft Inventions with a mind of their own, albeit a simple one. An Autonomous Invention is a mechanical marvel that functions only with the power of a Clockwork Dynamo. Creating an Autonomous Invention requires a minimum of Two Clockwork Dynamos and investing one Invention Point. The process of creating an Autonomous Invention requires 8 hours of work and 200 Scrap, plus an additional 100 for every Invention Point invested. Crafting an Autonomous Invention requires an Invention Check with a DC equal to 14 + 1 for every Invention Point invested. The check is made at the end of the process, and a failed check results in the attempt failing, and the loss of half of the Scrap used for that attempt.

Arcane Inspiration

Starting at sixth level, all of your Gadget and Equipment Inventions count as magical for the purpose of overcoming resistance and immunity to nonmagical attacks and damage.

Retrofit

Beginning at ninth level, you can alter existing Inventions. By spending 2 hours of work, you can add an additional property to an Invention, following the normal rules for crafting an Invention, with the exception that you may ignore the rule stating that you must add all properties at the same time.

Signature Mechanism

By level ten, you've become so familiar with a particular mechanism that you needn’t worry about the strain or maintenance for it. Choose one property for a Gadget or Combat Invention that does not require a Clockwork Dynamo and that you have built before. Adding this property to an Invention no longer requires an Invention Point, though you still must spend an amount of time and Scrap as if you had invested one. If you have any Invention Points currently invested in Inventions with that property, you immediately regain all such Points.

Trapsmith

Starting at thirteenth level, you gain Advantage to detect, and resistance to damage caused by, nonmagical traps. If one forces you to make a saving throw, you can use your Reaction to gain advantage on that save. Against magical traps, you instead may add 1d4 to your check to detect, reduce damage dealt by 1d10, and may use your Reaction to add 1d4 to your saving throw.

In addition, you can spend an action to modify an existing nonmagical trap with 5 Scrap and an Intelligence (Thieves’ Tools) check against the Trap’s disabling DC. A successful check causes the trap to fail to trigger when you or any creature you choose when modifying would usually trigger it.

Clockwork Dynamist

At thirteenth level, the maximum number of Clockwork Dynamos you can have is increased to INT mod + half of your Proficiency Bonus (rounded down). At 20th level, this increases to INT mod + your Proficiency Bonus

Inventor's Acumen

By fourteenth level, your extensive experience in construction and creation have granted you the ability to detect weakness in the construction of physical bodies. You may spend an Ingenuity and use a bonus action to make an Intelligence(Insight) check, contested by the Constitution(Deception) check of a creature you can see within 30 feet of you. This creature must be corporeal and have a discernible anatomy, or be a Construct. If you succeed, you score a critical hit against that creature with a natural roll of 19 or 20 for the next minute or until you use this feature on another creature, and may learn one of the following pieces of information about that creature:

• Its remaining Hit Points
• Its current Armor Class
• All Vulnerabilities
• All resistances and Immunities

Inventive Armor

Beginning at fourteenth level, you can apply two Inventions to a single suit of armor, instead of just one. At 20th level, you can apply 3.

Edeficionado

When you reach seventeenth level, your extensive understanding of mechanics and physics allows you to quickly, easily and accurately tear down or construct buildings and structures. All damage you deal against objects and structures is doubled.

You may also spend Scrap an time constructing a durable building in an area, as long as you have room for it. You can do this during a Short or Long Rest, but work at half speed if you do so, and must sleep for at least 4 hours of your Long Rest.

• For each 15 Scrap and 10 minutes spent, you can construct a 5x5 wall, floor, or ceiling with AC 20, resistance to all damage, immunity to Psychic and Poison damage, and 50 HP
• For each 10 Scrap and 10 minutes spent, you can increase the AC of a wall or door by 1 and its HP by your level. You can do this once per door or 5x5 section of wall.
• For each 10 Scrap and 10 minutes spent, you can grant any object or wall resistance to all damage, and immunity to Psychic and Poison damage.
• For each 5 Scrap and 15 minutes spent, you can construct a staircase that is up to 5 feet wide and rises up to 12 feet in height, and has AC 15, 20 HP, and immunity to Psychic and Poison damage.
• For each 5 Scrap and 10 minutes spent, you can install a 3x3 window in a wall you have built. You can choose for this window to open, or to be permanently closed. The window has an AC 10 and 5 HP, but for each additional Scrap spent you can increase its AC by 1 or its HP by 5, to a maximum of 3 additional scrap.
• For each 3 Scrap and 5 minutes spent, you can construct a door with AC 15 and 20 HP. You can spend up to 3 additional Scrap to increase its AC by 1 and HP by 5 per Scrap. You can spend an additional 2 Scrap and 5 minutes constructing a lock and matching key for the door.
• Any physical trap you construct in one of your buildings requires half the gold, Scrap, and/or time to construct as normal.

Mechanical Prosthetics

Your inventive drive and passion for improvement have led you to construct replacements for your body itself. Due to the extreme complexity of organic bodies and the precision required to make such prosthetics, these Prosthetics take quite a lot of time and resources to build, despite their small size. A single Mechanical Prosthetic requires 800 Scrap, a Clockwork Dynamo, and 16 hours of work, broken into increments of no longer than 8 hours at a time.

At the end of this period, you must succeed on a DC 25 Inventor Check, or else the attempt is ruined and you lose half of the Scrap used on it. You can then attempt to install the Prosthetic on yourself. This process is a delicate one, and requires you to remove the body part to be replaced, often with help of another creature. The creature removing the body part must succeed on a DC 20 Wisdom(Medicine) check. If successful, the body part is removed and you permanently lose two of your highest Hit Dice. On a failure, the body part is removed and you permanently lose four of your Highest Hit Dice.

Finally, the Prosthetic must be attached. This requires both a DC 20 Wisdom(Medicine) check and a DC 20 Invention Check, the latter of which is made with disadvantage if performed by someone other than you. If both succeed, the Prosthetic is attached successfully. If the Medicine check fails, the attempt is unsuccessful but may by attempted again, and you permanently lose one of your highest Hit Dice. If the Invention check fails, the attempt is unsuccessful. If the Invention check fails by 10 or more, the Prosthetic is ruined and must be re-created.

You can break the prosthetic into Crafter’s Scrap normally. Hit dice lost in this way can only be regained if the body part is regrown per the Regenerate spell.

Each body part can only have one Prosthetic, and you can have a maximum number of Prosthetics equal to your CON mod.

• Ticking Heart This Prosthetic requires an additional Clockwork Dynamo, the Medicine Check to remove it is increased by 5, and if that check fails, you die. With this Prosthetic, you gain Resistance to Poison damage, Immunity to Diseases, advantage on Constitution saving throws, and advantage on Death Saving throws. In addition, whenever you take Lightning Damage from something other than a Cantrip, you gain a number of Temporary Hit Points equal to your level. This Temporary HP is gained before the damage is dealt.
• Arm Compartment This Prosthetic replaces a single arm. With it, you can store up to 4 small objects that you could hold in your hand such as a dagger or lock, or up to 4 Artisan’s tools. These objects are completely hidden and cannot be located except by magic or by disassembling your arm. Due to the hollow spaces, this arm grants you advantage on checks made to swim on the surface of water or to remain afloat. You also gain either a Claw or Slam attack with this arm, which is a Strength-based melee attack and does 1d6 Slashing or Bludgeoning damage.
• Arm Guard This Prosthetic replaces one arm. With it, your AC increases by 2. You also gain either a Claw or Slam attack with this arm, which is a Strength-based and does 1d6 Slashing or Bludgeoning damage.
• Combat Arm This Prosthetic replaces one arm. With it, you gain a Claw or Slam attack, which is a Strength-based melee attack that does 1d10 Slashing or Bludgeoning damage. In addition, your Strength score increases by 2, to a maximum of 22. If you have one of the other arm prosthetics on your other arm, you can also use that arm’s Claw or Slam attack when you use the Attack action to use this one on your turn.
• Precise Arm This Prosthetic replaces one arm. With it, your Dexterity score is increased by 2 to a maximum of 22. Immediately before making a Dexterity-based attack on your turn, you can use a bonus action to gain advantage on the attack roll. In addition, you gain a Claw attack with this arm, which is a Dexterity-based melee attack. Finally, you gain Advantage on dexterity checks made to work with an handle very fine items such as locks or certain Artisan Tools.
• Lensed Eye This Prosthetic replaces one eye. With it, you have Darkvision to a range of 60 feet, and can clearly perceive details up to 1 mile away. It confers advantage on all Perception and Investigation checks, as well as checks made to handle very fine items such as locks or certain Artisan Tools. In addition, you can use a bonus action to cause it to emit a cone of light, centered on you. This cone can be of any size up to 120 feet, in 10-foot increments, and the first half of the cone is bright light while the second is dim. You can use a bonus action to change the cone to any 10-foot increment, up to 120 feet, or to narrow the cone to a 1-foot line with a length equal to its current cone size or back into a cone again, or to turn it off.
• Iron Jaw This Prosthetic replaces your lower and upper jaw, but not your tongue. Because of the complexities of a working mouth, both Medicine check DCs for this prosthetic increase by 1. You gain a Bite Attack, a Strength-based melee attack that does 1d8 Piercing damage. You can also grind up items with your teeth, turning many common materials you can fit into your mouth into a fine powder. You also reduce the damage of all Unarmed Strikes or Natural Attacks that connect near your face by 1d4. Work with your DM to determine how often this occurs. For example, a punch might strike your jaw and be reduced, but a bite attack rarely will bite your own mouth. Finally, you gain Advantage on Charisma(Intimidation) checks.
• Runner’s Legs This Prosthetic replaces both of your legs. Your land speed increases by 20 feet. Your jump distance is doubled. You also gain a Kick attack, a Strength-based melee attack that does 1d6 bludgeoning damage.
• Combat Legs This Prosthetic replaces both of your legs. With it, your land speed increases by 5 feet and you gain a Kick attack, a Strength-based melee attack that does 1d12 bludgeoning damage. If you move at least 20 feet in a straight line before making this attack, you have advantage on the attack roll. In addition, you can Disengage as a bonus action.

Gadget Inventions

Gadget Inventions usually take an action to use or set, and may have a simple trigger such as a pressure plate or tripwire. These kinds of Inventions usually serve some sort of out-of-combat purpose, but can be weapons in their own right, or may be a kind of trap.

A basic Gadget Invention requires 1 Invention Point and 15 Scrap to create and 5 Scrap for each Invention Point after the first, and requires an action to be used or set. If the Invention has a trigger, an action must be used to reset it each time it triggers. A Gadget Invention can be placed on the ground or a wall, and you can make an Intelligence(Sleight of Hand) check to try and hide it; a Wisdom (Perception) or Intelligence (Investigation) check opposed by your check is needed to detect the trap. A Gadget Invention can only be activated/triggered by a creature holding it or within 5 feet of it. A Gadget Invention can do one of the following:

• Emit 40 feet of Bright light and an additional 40 feet of dim light. This can be turned on or off as an action.
• Grant its user Darkvision with a range of 30ft.
• Grant a 1d4 bonus on a single kind of Strength or Dexterity skill check, such as athletics or acrobatics, chosen upon creation.
• Force a creature to succeed on a Dexterity Saving Throw or else take 2d6 Bludgeoning, Piercing, or Slashing damage, chosen upon creation
• Force a creature to succeed on a Constitution saving throw or else be Poisoned for 10 minutes. A creature can repeat this save at the end of each of its turns to it.
• The wielder can use an an action to make a Strength-based melee weapon attack. Inventors are proficient with this attack. On a hit, the target takes 1d10 bludgeoning, piercing, or slashing damage, chosen upon creation.
• Force a creature to succeed on a Dexterity saving throw or else be grappled by the Invention, Pushed or Pulled 5 feet, or be knocked prone. A creature grappled by the Invention can attempt an Acrobatics or Athletics check as an action on each of its turns to free itself.
• The device functions as a breathing apparatus, with a 1-hour supply of air. A creature wearing this device does not need to breathe as long as the Device has air in it. The air must be used in 1-minute increments, and you must spend 5 minutes and succeed on a DC10 Invention check to refill
• Grant Advantage on a single specific task, such as scaling a cliff, cutting glass, or carving stone.

Equipment Inventions

Equipment Inventions pertain to weapons and armor, and despite the name might have uses not directly related to combat. Nearly all Equipment Inventions modify existing weapons or armor, rather than being new items themselves. You can place up to two modifications onto a single weapon, with each Invention Check being made separately, though they must be added at the same time. A suit of armor can only have one modification at a time. An Equipment Invention requires 10 Scrap if applied to a weapon, or 20 if applied to armor. All Equipment Inventions require 1 Invention Point.

Autonomous Inventions

An Autonomous Invention is a mechanical marvel that functions entirely by the power of Clockwork Dynamos. You must use two Clockwork Dynamos and two Invention Points to create one. The creation process requires 24 hours of work, in increments no greater than 8 hours per day, and 100 Scrap for each Invention Point invested. At the end of this process, you must make an Invention Check against a DC of 13 + the total amount of Invention Points invested.

On a failure, the invention is functional, but one of the features you gave it does not function. This feature is always its Combat Intelligence if it has it, or is determined randomly by the DM. You do not know that the Invention is flawed until you use it for the first time. If you fail by 5 or more, instead the attempt is ruined and you lose half of the Scrap used. While within 5 feet of an Autonomous Invention, you (and only you) can use an Action to turn the Invention On or Off.

If an Autonomous Invention is reduced to 0 HP, it collapses. If you have access to its body, you can repair it with 8 hours of work and Scrap equal to half of the original amount of Scrap spent to create it. At the end of this period, it regains all of its HP.

You can repair an Autonomous Invention by spending 1 hour and 50 Scrap to restore 10+your INT mod HP, and can do this during a Short Rest. Due to the complex nature of the Automoton, the Mending cantrip cannot repair it.

When you create an Autonomous Invention, you assign a 12, a 14, and a 16 to its three physical ability scores.

Alchemic Focus

You've spent time researching and creating not only physical, but alchemic creations. Just as much a science as engineering, Alchemy is the study of turning one substance into another, or combining several to some effect. The ultimate goal of many Alchemists is to discover the Elixir of Life, which is rumored to grant imortality.

Alchemical Concoctions

Black Powder Focus

The iron and brass often employed by other Inventors are fine metals, of course, but some prefer to get their point across with a much humbler metal: lead. Inventors who work with black powder are well aware of its explosive potential, and have learned to put it to use.

Experimental Ammunition

Starting at level eleven, you can craft different kinds of ammunition. Each different kind requires an additional 20 Scrap per 10 bullets. When you load your Firearm, you choose whether to load normal or Experimental bullets, and the order in which they are loaded.

• Hollow Points deal an additional 1d6 damage.
• Armor-Piercing Bullets ignore resistance or immunity to nonmagical weapon attacks.
• Rubber Bullets deal bludgeoning (and not piercing) damage, and if a Rubber attack reduces a creature to 0 hit points, that creature falls unconscious and is stable.
• Beacon Rounds do normal damage, but if they hit grant advantage on the next attack roll made against that creature before the end of your next turn.
• If you are proficient with Alchemist’s Supplies, you can craft Elemental Bullets, that deal an additional 1d4 Acid, Cold, Fire, Lightning, or Poison damage. You choose the damage type when you craft the bullets.

Sharpshooter’s Call

By fifteenth level, you've developed an incredibly accurate eye. When you make an attack with a Firearm during your turn, you can spend an Ingenuity to make the attack a Called Shot, which targets a specific body part, to some effect.

• Head: The attack is made with Disadvantage. On a hit, the creature is stunned, and until the end of your next turn all attacks against it critically hit on a natural 19 or 20.
• Eye- The attack is made with Disadvantage. On a hit, the creature is blinded for 1 minute. The creature can attempt a CON save at the end of each of its turns, ending the condition on a success.
• Hand: On a hit, the creature drops whatever it is holding.
• Arm: On a hit, the creature has disadvantage on all attacks that use that arm until the end of your next turn.
• Torso: On a hit, the creature is knocked prone, or pushed back 10 feet (your choice)
• Legs: On a hit, the creature is knocked prone, or its Speed is reduced by half for 1 minute (your choice)

Mortar

Beginning at level eighteen, you can craft a powerful weapon that can cause damage over a large area, but is unable to attack the area near it. This Mortar requires 1 Invention Point invested, 100 Scrap, 8 hours of work, and requires a DC 15 Invention Check. On a failure, half of the Scrap is rendered useless, the attempt is ruined, and the mortar explodes, dealing 2d12 Fire damage to you. The projectile fired by a Mortar requires 1 hour and 20 Scrap to create, and no check. It cannot be modified by Experimental Ammunition.

The Mortar requires an action to securely anchor in the ground. Once placed, it cannot be moved unless an action is used to dislodge it. While operating a Mortar, you may use a bonus action to choose a point within 1000 feet of the mortar, but no closer than 300 feet. The Mortar requires an action to load and an action to fire.

When the Mortar fires, it sends a projectile 300 feet into the air. At the start of your next turn, the projectile explodes in an 80-foot high, 20-foot radius column centered on the point you chose. All creatures in that area must succeed on a Dexterity saving throw against your Invention DC, suffering 10d6 Piercing and 10d6 Fire damage on a failed save, or half as much on a successful save.

Physicist Focus

While other Inventors create more and more items to supplement their Inventions, the Physicist's understanding of the natural laws of the world allow them to be less dependent on their Inventions in combat. The Physicist is preternaturally skilled at plotting out trajectories, angles, forces, and velocities, and uses this information to strike their enemies in critical weak points, or to avoid incoming attacks.