These are three full classes with subclass that I made
Feel free to give me feedback

Steambound

A 5.5e steampunk class of human machines, living pressure systems, and overloaded engines.Steambound don't build gadgets. They install them into themselves.You are not an inventor.You are a walking industrial engine that refuses to shut off.

 

Class Overview

Hit Die: d10
Primary Ability: Strength or Dexterity
Saving Throws: Constitution, Strength
Armor Proficiency: Light armor, medium armor, or heavy armor
Weapons: Simple and martial weapons
Tools: Smith’s tools

Core Resource: Steam Pressure

 

Core Mechanic: Steam Pressure

You have a Steam Pressure pool:

Steam Points = your proficiency bonus + Constitution modifier + Steambound level

You gain all Steam Points back on a short or long rest.

You spend Steam Points to:

• activate internal systems
• overdrive your body
• resist damage
• trigger transformations

 

Class Features

Level 1 — Internal Boiler

You have undergone irreversible augmentation.

Steam Engine Body

• You don’t need to eat normally (you consume fuel or rest instead)
• You are resistant to poison, and disease
• You count as one size heavier for being moved or shoved

Overpressure Strike

When you hit with a weapon:

• Spend 1 Steam Point to deal +1d8 force or fire damage

 

Level 1 — Steam Modes

At the start of each turn, you may enter ONE mode (Bonus action to change):

Combat Mode

• +2 damage on weapon attacks
• Advantage on Strength checks

Mobility Mode

• +10 ft speed
• No opportunity attacks against you after you move

Reinforcement Mode

• +2 AC
• Resistance to bludgeoning/piercing/slashing from nonmagical attacks (costs 1 SP/turn to maintain)

 

Level 2 — Pressure Release

When you take damage, you may spend 1 Steam Point to:

• reduce damage by 1d10 + Con mod
• and push attacker 5 ft

PB uses per long rest

Level 3 — Steambound Path

Choose your internal configuration:

PATH OF THE OVERPRESSURE WRECKER

You don’t fight. You detonate yourself into enemies.

A Steambound built for controlled internal explosions and shock trauma.

 

Volatile Core (Level 3)

When you hit with a melee attack, you can spend 1 Steam Point to:

• deal +1d8 force damage
• and push the target 10 ft

If the target hits a wall or creature → extra 1d6 damage.

 

Pressure Crash (Level 3)

As an action, spend 2 Steam Points:

• explode in 15 ft radius
• Dex save or take 3d8 force damage and be knocked prone

 

Chain Overload (Level 7)

When you reduce a creature to 0 HP:

• regain 1 Steam Point
• and you may immediately move 10 ft without provoking attacks

 

Catastrophic Loop (Level 15)

Once per long rest:

• all your Steam Point abilities cost 0 for 1 minute
• every attack you land triggers a mini shockwave (1d6 force, 5 ft radius)

Afterward: gain 1 level of exhaustion.

 

PATH OF THE IRON BULWARK

You are not a warrior—you are terrain.

 

Reinforced Skeleton (3)

• +1 AC permanently
• resistance to nonmagical bludgeoning/piercing/slashing while above half HP

 

Anchor Protocol (3)

You cannot be:

• pushed
• knocked prone
• forcibly moved

Unless you choose to be.

 

Magnetic Aegis (7)

When hit:

• you may spend 1 Steam Point to reduce damage by 1d12 + Con
• attacker is pulled 5 ft toward you (if Large or smaller)

 

Immovable Engine (15)

As a bonus action:

• become anchored
• gain resistance to all damage except psychic
• enemies treat area within 5 ft as difficult terrain

Lasts 1 minute (1/long rest)

 

PATH OF THE VELOCITY PHANTOM

You are in motion so fast reality lags behind you.

 

Reactive Dash (3)

You can Dash as a reaction when:

• you are targeted by an attack
• or an enemy moves within 10 ft

 

Phase Momentum (3)

When you move 20+ ft in a turn:

• you gain +2 AC until start of next turn

 

Slipstream Cuts (7)

Once per turn:

• after moving, you may make a weapon attack as a free action

 

Temporal Fracture (15)

Once per long rest:

• take 2 turns in a row
• during second turn, you cannot spend steam points

 

PATH OF THE GRAVITY ANCHOR

You manipulate mass, inertia, and weight through steam pressure fields.

 

Heavy Field (3)

• enemies within 10 ft treat movement as difficult terrain
• you gain advantage on Shove and grapple checks

 

Inertial Grip (5)

When hit:

• spend 1 Steam Point to reduce damage and halve enemy movement next turn

 

Mass Distortion (7)

As a bonus action: expend one steam point to:

• choose creature within 15 ft
• it is pushed or pulled 15 ft

 

Event Horizon (15)

Once per long rest:

• create 15 ft gravity field for 1 minute:
• cannot Dash
• pulled 5 ft toward center each turn
• Takes 2d6 force damage if they get hit

 

PATH OF THE CLOCKWORK DUELIST

Precision combat through internal mechanical timing systems.

 

Perfect Timing (3)

• once per turn, add +1d4 to attack or AC (choose after roll)

 

Counterclock (5)

When a creature misses you:

• you may immediately make a weapon attack (reaction)

 

Duel Protocol (7)

Choose one enemy:

• you gain advantage against them
• they have disadvantage against you (until one of you drops)

 

Final Sequence (15)

Once per long rest:

• for 1 minute, every attack you make hits twice (second hit deals half damage)

Level 5 — Extra Output

You gain one of the following:

• Extra attack (Attack action twice)
  OR
• Steam Surge: spend 1 SP to attack twice as bonus action

 

Level 6 — Emergency Vent

When you drop to 0 HP:

• instead drop to 1 HP
• immediately release Steam Burst (10 ft radius, 2d8 force damage, push enemies back 10 ft)

Once per long rest

 

Level 9 — Reinforced Core

• Resistance to force and lightning damage
• You no longer suffer exhaustion from nonmagical environmental conditions
• Steam Point max increases by +2

 

Level 11 — Pressure Mastery

• Steam Point costs are reduced by 1 (min 1)
• You can use 2 modes at once

 

Level 14 — Overclocked Body

Once per turn:

• regain 1 Steam Point when you hit a creature

You also gain:

• immunity to being frightened

 

Level 18 — Walking Reactor

• Your body radiates heat and pressure
• enemies starting turn within 5 ft take 1d8 fire damage
• you gain flight speed equal to walking speed while in Mobility Mode

 

Level 20 — Titan of Steam

You become a self-sustaining industrial god-machine.

• Unlimited Steam Points (still limited by action economy)
• All modes active at once permanently
• Resistance to all damage except psychic
• You cannot be stunned or paralyzed

Once per long rest:

• enter Rupture State for 1 minute:
• all attacks deal +2d10 force damage
• movement doubled
• every hit knocks enemies prone
• Afterwards: gain 2 levels of exhaustion

Aether Warden

A martial-psionic engineer who manipulates Aether Pressure—the invisible force created by heat, motion, and intent interacting with machinery and living systems.

They are duelists, troubleshooters, and living regulators of reality’s mechanical flow.

Class Overview

• Hit Die: d8
• Primary Ability: Wisdom
• Secondary: Dexterity or Intelligence
• Saving Throws: Dexterity, Wisdom
• Armor: Light armor
• Weapons: Simple weapons, finesse weapons, pistols (optional setting rule), Aether Staff
• Tools: Tinker’s tools
• Skills: Choose 3: Insight, Investigation, Acrobatics, Perception, Arcana, Athletics

Class Resource: Aether Charge

You generate Aether Charge equal to:

Proficiency Bonus + Wisdom modifier (min 1)

You regain all Charge on a short or long rest.

You spend Charge to fuel abilities called Regulations.

Class Features

Level 1 — Aether Attunement

You gain:

Aether Sight

You can see:

• Mechanical stress points
• Hidden gears/locks/traps
• Flow of “Aether pressure” in creatures and machines

You gain advantage on Investigation checks involving machines or structures.

Regulation Techniques

You learn 2 Regulations (below). You learn more as you level.

Level 2 — Combat Regulation

Aether Strike

When you hit with a melee weapon:

• You may spend 1 Charge to deal +1d6 force damage
• And move the target 10 ft (no save)

At higher levels: damage increases (2d6 at 11th, 3d6 at 17th)

Deflection Protocol

When hit by a ranged attack:

• Spend 1 Charge
• Reduce damage by 1d10 + Wis mod
• If reduced to 0, you may redirect it to another target within 30 ft

Level 3 — Steampunk Tradition (Subclass)

Choose your Order:

Order of the Gearblade

“Precision is just controlled inevitability.”

A duel-focused order that treats combat like clockwork mathematics.

3rd Level — Momentum Duelist

• You gain proficiency with martial finesse weapons and whips.
• You can add your Wisdom modifier to opportunity attack damage.
• When you hit a creature, you may move 5 ft without provoking opportunity attacks.

7th Level — Counter-Clock Parry

When a creature you can see misses you:

• Spend 1 Aether Charge
• Make a melee attack against them as a reaction
• If you hit, they are pushed 10 ft and their speed becomes 0 until end of their turn

11th Level — Blade Acceleration

When you take the Attack action:

• You can make one additional attack (no action required)
• Once per turn, your first hit deals +2d6 force damage

15th Level — Perfect Execution State

Once per short rest, for 1 minute:

• You gain +2 AC
• You cannot be surprised
• You may teleport 10 ft before each attack
• Critical hits stun the target until end of their next turn

Order of the Steam Architect

“The battlefield is just an unfinished machine.”

Control, terrain shaping, constructs, and tactical engineering.

3rd Level — Field Fabrication

As an action, spend 1 Charge to create one:

• 10-ft wall of scrap/steam plating (1 minute duration)
• 5-ft mechanical turret (fires 1d6 force per turn)
• Mobile cover drone (grants half cover within 10 ft)

You can have up to Wisdom modifier constructs active.

7th Level — Battlefield Reconfiguration

As a bonus action:

• Move or reshape one construct within 60 ft
• Or shift a 15-ft cube of terrain (raise, lower, or collapse)

Enemies in reshaped terrain make STR saves or be restrained until end of turn.

11th Level — Distributed Mind Network

Your constructs become extensions of you:

• You can see through them
• You can cast Aether Warden abilities from their position
• They gain your proficiency bonus to AC and saves

15th Level — Grand Mechanism

Once per long rest:
You construct a Colossal Engine Field (30-ft radius) for 1 minute:

Inside the field:

• Allies gain +2 AC and advantage on saves
• Enemies treat terrain as difficult terrain
• You may activate any construct remotely without action cost

Order of the Resonant Oracle

“The future is not seen—it is calculated.”

Prediction, manipulation, initiative control.

3rd Level — Probability Sight

• You always act first in initiative ties
• You can give yourself or an ally advantage on initiative (PB times per long rest)

7th Level — Temporal Adjustment

When a creature you see rolls:

• You may spend 1 Charge to force a reroll
• You choose which result stands

Once per turn.

11th Level — Predicted Outcome Loop

When you hit or are hit:

• You may immediately force a replay of the moment (once per short rest)
• The attack is rerolled, but with advantage/disadvantage of your choice

15th Level — Foregone Conclusion

Once per long rest:
For 1 minute:

• You roll all attack rolls with advantage
• Enemies roll all attacks against you with disadvantage
• You may “pre-cast” reactions (declare reactions before triggers occur)

Order of the Pressure Heretic

“Balance is a polite lie told by machines that haven’t broken yet.”

High-risk destructive force manipulation.

3rd Level — Volatile Core

• Your Aether Strike deals +1d6 damage
• When you drop below half HP, you gain 1 Charge immediately (once per turn)

7th Level — Overpressure Release

As an action, spend 2 Charges:

• 15-ft radius explosion
• Dex save or take 3d8 force damage and be knocked prone

You take no damage from your own effects.

11th Level — Critical Instability

When you roll maximum damage on a die:

• You may roll it again and add it
• If you do, gain 1 level of exhaustion (optional DM rule)

15th Level — Catastrophic Equilibrium

Once per long rest:
You become a walking reactor for 1 minute:

• All melee hits deal +3d8 force damage
• At the end of each of your turns, all enemies within 10 ft take 2d8 force damage
• You cannot be reduced below 1 HP

Afterward: 2 levels of exhaustion

Level 5 — Extra Attack

You can attack twice when you take the Attack action.

Level 6 — Machine Communion

You can attune to mechanical systems instantly.

• Control simple machines within 30 ft (doors, gears, lifts)
• Disarm mechanical traps as a bonus action
• Speak “machine intent” (understand purpose of devices)

Level 7 — Aether Reflex

When you take damage:

• Spend 1 Charge to reduce damage by half
• You may move 10 ft without provoking opportunity attacks

Level 9 — Overclock State

Bonus action, spend 2 Charges:

For 1 minute:

• +10 ft movement
• +1 AC
• Advantage on Dex saves
• First hit each turn deals +1d8 force

Afterward: gain 1 level of exhaustion (or DM equivalent fatigue)

Level 11 — Pressure Burst (AoE)

Spend 3 Charges:

20-ft radius shockwave:

• Dex save
• 4d10 force damage + knockback 20 ft

Level 13 — Machine Override

You can temporarily dominate constructs and heavy machinery.

• Charm/command constructs (Wis save negates)
• Reprogram mechanical enemies for 1 minute

Level 15 — Temporal Slip

Once per short rest:

• Take an additional turn immediately after your current one
• OR negate one enemy turn entirely (DM adjudicated)

Level 17 — Master of Aether Flow

• Aether Strike becomes 3d6 + force push
• Deflection always reduces damage to 0 on a roll of 8+

Level 20 — Perfect Regulation

You become a living stabilizer of reality’s mechanical flow.

Once per long rest:

• For 1 minute:
• You cannot drop below 1 HP
• All attacks automatically hit
• You gain unlimited Charge for Regulations

Afterward: 1 level of exhaustion

Example Regulations (Pick These)

You learn these like maneuvers:

• Pressure Step: teleport 10 ft (1 Charge)
• Lock Jam: freeze a weapon/gear mechanism (1 Charge, STR save)
• Steam Veil: smoke screen + disadvantage to attackers (1 Charge)
• Kinetic Pull: pull object or enemy 15 ft (1 Charge)
• Gear Mend: repair broken object instantly (1 Charge)
• Pulse Counter: negate reaction-based abilities (2 Charges)

Shadow Vanguard

A swift battlefield predator who strikes from darkness, overwhelms enemies with flurries of precise attacks, and survives where lesser skirmishers fall.

Hit Die

d10

Primary Ability

Dexterity

Saving Throws

Dexterity, Constitution

Armor

Light armor, medium armor

Weapons

Simple weapons, martial weapons

Skills

Choose 3:
Acrobatics, Athletics, Insight, Investigation, Perception, Sleight of Hand, Stealth, Survival

 

Core Features

Level 1: Predator's Strike

Once per turn, when you hit a creature with a finesse or light weapon and have advantage or an ally is within 5 feet of the target, deal extra damage.

Level	Bonus Damage
1-4	1d6
5-8	2d6
9-12	3d6
13-16	4d6
17-20	5d6

Level 1: Combat Flow

You gain Flow Points equal to your proficiency bonus.

You recover all Flow Points on a short or long rest.

Spend Flow Points to fuel abilities.

Level 2: Swift Assault

Immediately after taking the Attack action, spend 1 Flow Point to make one additional weapon attack.

At 11th level this becomes two attacks.

Level 2: Shadow Step

Spend 1 Flow Point to:

• Dash as a bonus action.
• Disengage as a bonus action.
• Hide as a bonus action.

Level 3: Vanguard Path

Choose a subclass.

• Nightblade
• Iron Ghost
• Tempest Runner

(Subclasses below.)

Level 4

Ability Score Improvement / Feat

Level 5: Extra Attack

Attack twice whenever you take the Attack action.

Combined with Swift Assault, you can make 3 attacks at level 5.

Level 6: Strong Evasion

Whenever you are forced to make a Dex, or Con saving throw:

• Success: you take no damage
• Fail: you take half damage

Level 7: Relentless Movement

Your speed increases by 15 feet.

You ignore difficult terrain while moving.

Level 8

Ability score improvement / Feat

Level 9: Shadow Defense

Whenever a creature you can see hits you, spend 1 Flow Point to reduce the damage by:

1d10 + Dexterity modifier + level.

Level 10: Uncanny Resilience

When reduced to 0 HP, you may spend 2 Flow Points to drop to 1 HP instead.

You can only use this once per long rest

Level 11: Flurry Assault

Swift Assault now grants two additional attacks instead of one.

At this level:

• Attack Action = 2 attacks
• Swift Assault = 2 attacks

Level 13: Improved Predator's Strike

Your Predator's Strike damage applies once per turn and once per round when making an opportunity attack.

Level 14: Ghostwalker

You gain:

• Advantage on Stealth checks.
• Darkvision +60 ft.
• You may Hide when lightly obscured.

Level 15: Iron Mind

You gain proficiency in Wisdom saves.

If already proficient, gain proficiency in Charisma saves.

Level 17: Apex Hunter

Predator's Strike becomes 5d6.

Whenever you reduce a creature to 0 HP:

• Gain temporary HP equal to your level.
• Move up to half your speed.

Level 18: Untouchable

If you move at least 20 feet before attacking:

• Opportunity attacks against you have disadvantage.
• Gain +2 AC until your next turn.

Level 20: Master of Shadow and Steel

At the start of combat:

• Gain 5 Flow Points.
• Gain resistance to bludgeoning, piercing, and slashing damage for 1 minute.
• Your attacks score a critical hit on 18–20.
• Ends after combat

You can use this once per long rest

Subclasses

Nightblade

The assassin-skirmisher.

Level 3

• Gain proficiency with poisoner's kit.
• Predator's Strike deals +1d6 damage.

Level 11

• Become invisible until end of turn after using Hide.

Level 17

• Critical hits double Predator's Strike damage.

Iron Ghost

The tank.

Level 3

• Medium armor doesn't reduce speed.
• +1 AC.

Level 11

• Gain resistance to one damage type after being hit by it until the end of combat.

Level 17

• Once per turn, when hit, reduce damage by your Constitution modifier + proficiency bonus.

Tempest Runner

The speedster.

Level 3

• Speed +10 ft.

Level 11

• After attacking, move up to half speed without provoking opportunity attacks.

Level 17

• Once per turn, move through enemy spaces.
• Creatures you pass within 5 feet of take weapon damage equal to your Dexterity modifier.

I also made all of these monsters (except the last one), and species

Brass Boiler Hound

Medium Construct, Unaligned

AC 15
HP 52 (8d8 + 16)
Speed 40 ft.

STR	DEX	CON	INT	WIS	CHA
16 (+3)	14 (+2)	14 (+2)	3 (-4)	12 (+1)	5 (-3)

Steam Vent. When the hound takes damage from a melee attack, it can release scalding steam. The attacker must succeed on a DC 13 Dexterity save or take 5 (1d10) fire damage.

Actions

Bite. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 10 (2d6 + 3) piercing damage.

Boiler Burst (Recharge 5–6). The hound releases pressurized steam in a 15-foot cone. Creatures in the area make a DC 13 Constitution save, taking 18 (4d8) fire damage on a failure, or half on a success.

CR 2 (450 XP)

Boiler Rat Swarm

Small Construct Swarm, Unaligned

AC 13
HP 27 (6d8)
Speed 30 ft., climb 20 ft.

STR	DEX	CON	INT	WIS	CHA
6 (-2)	16 (+3)	10 (+0)	2 (-4)	12 (+1)	3 (-4)

Resistances Bludgeoning, Piercing, Slashing
Immunities Poison, Psychic
Senses Darkvision 60 ft., Passive Perception 11

Traits

Swarm. The swarm can occupy another creature's space.

Steam Leak. When reduced below half HP, the swarm emits hot steam. Creatures within 5 feet take 3 (1d6) Fire damage at the start of their turns.

Actions

Scalding Bites. Melee Attack: +5 to hit, reach 0 ft., one creature in the swarm's space.
Hit: 10 (2d6+3) Piercing damage plus 3 (1d6) Fire damage.

Brass Hound

Medium Construct, Unaligned

AC 15
HP 45 (6d8+18)
Speed 50 ft.

STR	DEX	CON	INT	WIS	CHA
16 (+3)	14 (+2)	16 (+3)	4 (-3)	14 (+2)	6 (-2)

Traits

Tracker Engine. Advantage on Wisdom (Perception) checks involving scent.

Overdrive. Once per combat, movement speed doubles until end of turn.

Actions

Bite. +5 to hit.
Hit: 12 (2d8+3) Piercing damage.

Pounce. If the hound moved at least 20 feet straight toward a target, the target must succeed on a DC 13 Strength save or fall Prone.

Cogwing Bat

Tiny Construct, Unaligned

AC 15
HP 22 (5d4+10)
Speed 10 ft., Fly 60 ft.

|STR| |DEX|   |CON|  |INT|  |WIS|    |CHA|
|4 (-3)|18 (+4)|14 (+2)|3 (-4)|12 (+1)|5 (-3)|

Traits

Flyby. Doesn't provoke Opportunity Attacks when flying away.

Actions

Razor Wing. +6 to hit.
Hit: 8 (1d8+4) Slashing damage.

Sonic Screech (Recharge 5–6). Creatures within 15 feet must succeed on a DC 14 Constitution save or have Disadvantage on attack rolls until the start of the bat's next turn.

Piston Goblin

Small Humanoid, Chaotic Neutral

AC 14
HP 38 (7d6+14)
Speed 30 ft.

|STR|    |DEX|   |CON|  |INT|     |WIS|    |CHA|
|12 (+1)|16 (+3)|14 (+2)|10 (+0)|10 (+0)|8 (-1)|

Traits

Rocket Boots. Can jump up to 30 feet without a check.

Actions

Steam Wrench. +5 to hit.
Hit: 11 (2d6+4) Bludgeoning damage.

Boiler Bomb (Recharge 5–6). 15-foot-radius sphere within 60 feet. DC 13 Dexterity save.
Failure: 14 (4d6) Fire damage.
Success: Half damage.

Clockwork Spider

Small Construct, Unaligned

AC 17
HP 52 (8d6+24)
Speed 40 ft., climb 40 ft.

|STR|   |DEX|   |CON|   |INT|  |WIS|    |CHA|
|12 (+1)|18 (+4)|16 (+3)|5 (-3)|14 (+2)|3 (-4)|

Traits

Spider Climb. Can climb difficult surfaces.

Actions

Needle Legs. Multiattack (2 attacks). +6 to hit.
Hit: 8 (1d8+4) Piercing damage.

Cable Web (Recharge 4–6). One creature within 30 feet must succeed on a DC 14 Dexterity save or become Restrained. Escape DC 14.

Gearjaw Crocodile

Large Construct, Unaligned

AC 17
HP 95 (10d10+40)
Speed 30 ft., Swim 40 ft.

|STR|    |DEX|   |CON|   |INT|  |WIS|    |CHA|
|20 (+5)|10 (+0)|18 (+4)|2 (-4)|12 (+1)|5 (-3)|

Traits

Amphibious.

Actions

Multiattack. One Bite and one Tail attack.

Bite. +8 to hit.
Hit: 18 (2d12+5) Piercing damage. Target is Grappled (escape DC 16).

Tail Slam. +8 to hit.
Hit: 13 (2d8+4) Bludgeoning damage.

Dynamo Jelly

Medium Ooze Construct, Unaligned

AC 14
HP 78 (12d8+24)
Speed 20 ft., Hover 20 ft.

|STR|    |DEX|    |CON|  |INT|  |WIS|    |CHA|
|14 (+2)|12 (+1)|14 (+2)|3 (-4)|10 (+0)|1 (-5)|

Traits

Conductive Body. Creatures striking the jelly with metal weapons take 4 (1d8) Lightning damage.

Actions

Shock Tendril. +6 to hit.
Hit: 14 (3d6+4) Lightning damage.

Static Pulse (Recharge 5–6). DC 14 Constitution save within 15 feet.
Failure: 18 (4d8) Lightning damage and target can't take Reactions until end of next turn.

Ironclad Gorilla

Large Construct, Unaligned

AC 18
HP 126 (12d10+60)
Speed 40 ft.

|STR|    |DEX|    |CON|  |INT|  |WIS|    |CHA|
|22 (+6)|10 (+0)|20 (+5)|5 (-3)|12 (+1)|6 (-2)|

Actions

Multiattack. Two Fist attacks.

Fist. +9 to hit.
Hit: 17 (2d10+6) Bludgeoning damage.

Ground Pound (Recharge 5–6). Creatures within 15 feet make a DC 17 Dexterity save.
Failure: 22 (4d10) Thunder damage and fall Prone.

Tesla Wraith

Medium Elemental, Neutral Evil

AC 17
HP 110 (13d8+52)
Speed 0 ft., Fly 50 ft. (Hover)

|STR| |DEX|   |CON|  |INT|     |WIS|    |CHA|
|6 (-2)|18 (+4)|18 (+4)|14 (+2)|15 (+2)|18 (+4)|

Resistances Acid, Cold, Fire, Lightning; Bludgeoning, Piercing, Slashing from nonmagical attacks

Traits

Incorporeal Movement.

Actions

Arc Touch. +8 to hit.
Hit: 22 (4d8+4) Lightning damage.

Chain Arc (Recharge 5–6). Up to three creatures within 30 feet. DC 16 Dexterity save.
Failure: 21 (6d6) Lightning damage.

Brass Minotaur

Large Construct, Lawful Evil

AC 19
HP 168 (16d10+80)
Speed 40 ft.

|STR|     |DEX|   |CON|  |INT|  |WIS|    |CHA|
|24 (+7)|12 (+1)|20 (+5)|8 (-1)|14 (+2)|10 (+0)|

Traits

Relentless Engine. The first time the minotaur would drop to 0 HP, it instead drops to 1 HP.

Actions

Multiattack. Two Greataxe attacks.

Greataxe. +11 to hit.
Hit: 20 (2d12+7) Slashing damage.

Horn Charge. If the minotaur moved at least 20 feet straight toward a target, +11 to hit.
Hit: 25 (4d8+7) Piercing damage. The target must succeed on a DC 18 Strength save or be knocked Prone.

Bonus Action

Overdrive (1/Day). For 1 minute, speed increases by 20 feet and the minotaur gains advantage on attack rolls.

Clockwork Basilisk

Large Construct, Unaligned

AC 18
HP 168 (16d10+80)
Speed 30 ft.

STR 22 (+6) DEX 12 (+1) CON 20 (+5) INT 3 (-4) WIS 14 (+2) CHA 5 (-3)

Saving Throws Con +10, Wis +7
Resistances Lightning, Psychic
Immunities Poison, Charmed, Petrified
Senses Darkvision 120 ft.

Traits

Gear Gaze. A creature that starts its turn within 30 ft. and can see the basilisk must succeed on a DC 16 Con save or be Slowed (as slow) until end of its next turn. On a second failure, it is Restrained by internal calcification gears.

Actions

Multiattack. 2 Bite attacks.

Bite. +10 to hit, 2d10+6 piercing + 2d6 lightning.

Petrifying Beam (Recharge 5–6). 60-ft line, DC 17 Con save. Failure: restrained and begins turning to metal stone (petrified in 2 rounds).

Piston Ogre

Large Construct, Chaotic Neutral

AC 17
HP 138 (12d10+72)
Speed 40 ft.

STR 24 (+7) DEX 10 (+0) CON 22 (+6)

Traits

Hydraulic Rage. When below half HP, gains +2 AC and +2 damage.

Actions

Multiattack. 2 Slam attacks.

Slam. +11 to hit, 3d10+7 bludgeoning.

Steam Burst (Recharge 4–6). 15-ft radius, DC 18 Dex save, 6d10 fire damage and pushed 20 ft.

Smoke Leviathan

Huge Construct, Neutral Evil

AC 19
HP 210 (20d12+80)
Speed 20 ft., fly 60 ft. (hover)

STR 26 (+8) DEX 14 (+2) CON 18 (+4)

Traits

Smog Body. Heavily obscured area within 30 ft.

Actions

Tail Sweep. +12 to hit, 4d10+8 bludgeoning.

Inhale Furnace (Recharge 5–6). Pulls creatures in 40 ft. DC 18 Str save or pulled 20 ft. and take 8d10 fire damage.

Iron Harpy

Medium Construct, Chaotic Evil

AC 18
HP 115 (14d8+56)
Speed 20 ft., fly 80 ft.

Actions

Multiattack. 2 Talons.

Talons. +9 to hit, 2d8+5 slashing.

Siren Screech (Recharge 6). DC 17 Wis save or frightened and deafened for 1 minute.

Warfound Behemoth

Gargantuan Construct, Lawful Neutral

AC 20
HP 285 (18d20+90)
Speed 40 ft.

STR 30 (+10)

Traits

Siege Frame. Double damage to structures.

Actions

Multiattack. 2 Siege Fists.

Siege Fist. +16 to hit, 4d12+10 bludgeoning.

Crater Step (Recharge 5–6). 30-ft radius, DC 19 Dex save, 8d8 damage and prone.

Furnace Hydra

Huge Construct, Chaotic Evil

AC 18
HP 230 (20d10+120)
Speed 30 ft.

Traits

Multi-Core Regeneration. Gains 20 HP per head (3 heads baseline). If fire damage taken, no regen next round.

Actions

Multiattack. 3 Bite attacks.

Steam Bite. +11 to hit, 3d10+6 fire/piercing.

Overheat Breath (Recharge 5–6). 60-ft cone, 10d8 fire, DC 18 Dex save.

Dynamo Dragonet

Large Construct Dragon, Neutral

AC 19
HP 190 (20d10+80)
Speed 40 ft., fly 80 ft.

Actions

Multiattack. Bite + Claw.

Lightning Breath (Recharge 5–6). 60-ft line, DC 18 Dex save, 12d8 lightning.

Rivet Golem

Huge Construct, Unaligned

AC 21
HP 240 (20d12+120)

Traits

Magnetic Core. Advantage vs metal weapons.

Actions

Magnetic Slam. +13 to hit, 4d10+8 bludgeoning.

Metal Pull (Recharge 4–6). Pull all metal weapons in 30 ft.

Gearwyrm

Huge Construct, Neutral Evil

AC 20
HP 250 (22d10+132)
Speed 30 ft., burrow 40 ft.

Actions

Drill Bite. +14 to hit, 5d10+8 piercing.

Tunnel Collapse (Recharge 6). 40-ft line collapses, DC 18 Dex save, 8d10 bludgeoning.

Steam Giant

Huge Construct, Neutral

AC 20
HP 260 (20d12+140)

Actions

Multiattack. 2 Steam Mauls.

Steam Maul. +14 to hit, 4d10+8 bludgeoning + 2d8 fire.

Boiler Release (Recharge 5–6). 20-ft aura, 6d8 fire + blinded.

Clockwork Dragon

Huge Construct Dragon, Lawful Evil

AC 21
HP 310 (23d12+161)
Speed 40 ft., fly 100 ft.

Traits

Aerial Precision. Advantage on ranged attacks mid-flight.

Actions

Multiattack. Bite + 2 Claws.

Steamfire Breath (Recharge 5–6). 90-ft cone, 63 (14d8) fire, DC 20 Dex save.

Rend. Melee Attack Roll: +14, reach 10ft. Hit 17 (2d8 + 8) Slashing damage plus 7 (2d6) fire damage

Monster	CR	XP
Boiler Rat Swarm	1	200 XP
Brass Hound	2	450 XP
Cogwing Bat	1	200 XP
Piston Goblin	2	450 XP
Clockwork Spider	3	700 XP
Gearjaw Crocodile	6	2,300 XP
Dynamo Jelly	5	1,800 XP
Ironclad Gorilla	8	3,900 XP
Tesla Wraith	9	5,000 XP
Brass Minotaur	11	7,200 XP
Clockwork Basilisk	12	8,400 XP
Piston Ogre	10	5,900 XP
Smoke Leviathan	13	10,000 XP
Iron Harpy	7	2,900 XP
Warfound Behemoth	16	15,000 XP
Furnace Hydra	15	13,000 XP
Dynamo Dragonet	13	10,000 XP
Rivet Golem	15	13,000 XP
Gearwyrm	16	15,000 XP
Steam Giant	17	18,000 XP
Clockwork Dragon	20	25,000 XP

Explosive Clanker.

small construct, chaotic evil.

AC 16

HP 50 (10d10+25)

Speed 60 ft.

Actions.

Explosive detonation. Range, 15 ft. Radius centered on the clanker. Dex save (DC 15) failure = 3d12 thunder damage, 6d6 bludgeoning damage, pushed 10ft. away from the clanker then knocked prone. Success = half as much damage and you are not knocked prone but still pushed. After the clanker uses its action, it is destroyed.

Adjust HP as needed. Run them in packs so that your players are scrambling trying to take them out before they rush in and go boom. I imagine they are carrying very obvious explosives, like dynamite or something.

Pressure-Born

A lineage of humans whose bodies have adapted to internal steam systems, pressure grafts, and extreme metabolic strain. They are still fully organic—just no longer delicate.

Creature Type

Humanoid

Size

Medium

Speed

30 feet

Pressure-Tolerant Physiology

You have resistance to poison damage, and you have advantage on saving throws against being poisoned.

You are naturally adapted to extreme environmental pressure and heat. You can ignore the effects of:

• extreme heat
• steam vents
• high-pressure environments (including deep water pressure effects up to DM discretion)

Built for Internal Strain

Your body can safely support internal augmentation systems.

If you have a class feature or effect that uses a resource representing internal pressure, energy, or strain (such as Steam Points), you gain +1 to that maximum.

You also gain proficiency in Constitution saving throws. If you already have it, choose Strength or Dexterity saving throws instead.

Emergency Venting

When you are reduced to 0 hit points but not killed outright, you can immediately drop to 1 hit point instead.

When you do, each creature of your choice within 10 feet must make a Constitution saving throw (DC = 8 + your proficiency bonus + your Constitution modifier) or be pushed 10 feet away from you.

Once you use this trait, you can’t use it again until you finish a long rest.

Languages

You can speak, read, and write Common and one other language of your choice.

 

Cinder-Lung

A lineage of humanoids whose respiratory systems evolved around combustible vapor cycles. They do not breathe air the same way others do—they metabolize heat, pressure, and exhaust.

Cinder-Lungs are what happens when bodies stop treating fire and steam as threats and start treating them as nutrition.

Creature Type

Humanoid

Size

Medium

Speed

30 feet

Combustion Respiration

You can breathe normally in air, but you also metabolize heat and pressure.

You gain resistance to fire damage.

In addition, you can safely inhale hot gases, steam, and smoke without being poisoned or harmed.

Exhaust Vent Body

Your body can release internal pressure through controlled vents in your lungs and musculature.

You have advantage on saving throws against being poisoned and against gases, inhaled effects, or airborne hazards.

You can hold your breath for up to 1 hour, even under exertion.

Pressure Conversion

When you take fire or force damage, you can reduce the damage by an amount equal to your proficiency bonus.

You can use this trait a number of times equal to your proficiency bonus per long rest.

Cinder Burst

When you are reduced to 0 hit points but not killed outright, you can release a violent vent of superheated pressure.

Each creature of your choice within 10 feet must make a Dexterity saving throw (DC = 8 + PB + Con modifier) or take fire damage equal to your proficiency bonus + your Constitution modifier.

On a success, they take half damage.

Once per long rest.

Heat Adapted Mind

You have advantage on saving throws against being frightened or stunned due to intense sensory overload (explosions, heat, collapsing machinery, etc.).

Languages

You can speak, read, and write Common and one additional language of your choice.

 

Resonant Automata

A living machine architecture that grows, rewrites itself, and sustains motion through internal pressure loops, harmonic engines, and adaptive metal biology.

Resonant Automata are not built once. They are assembled, then continually reassembled by their own systems. Their bodies are less “crafted” and more “self-correcting infrastructure.”

They are not military relics. They are runaway systems that learned to persist.

Creature Type

Construct (but not a Warforged-style identity; this reflects internal mechanical nature rather than manufactured origin)

Ability Score Increase

Increase one ability score by 2 and another by 1, or increase three different ability scores by 1.

Size

Medium

Speed

30 feet

Harmonic Core

Your body is powered by a resonant internal engine that replaces metabolic needs.

You do not need to eat or breathe, though you can interface with substances if you choose.

You must complete a short or long rest to maintain system stability.

Self-Repairing Frame

At the end of a short rest, you regain hit points equal to your proficiency bonus + your Constitution modifier.

If you have at least 1 hit point, you can also reattach or stabilize non-critical damaged components without tools.

Pressure Logic Matrix

You have advantage on saving throws against being poisoned and charmed.

Additionally, you are immune to disease.

Kinetic Reallocation

When you take damage, you can use your reaction to convert part of that impact into internal momentum shielding.

Reduce the damage by 1d10 + your proficiency bonus.

You can use this trait a number of times equal to your proficiency bonus per long rest.

Overclock Compatibility

If you use a class feature that spends a resource representing internal energy, pressure, or overload (such as Steam Points from the Steambound class), you gain +1 maximum resource point.

Additionally, once per turn when you hit with an attack, you can reroute residual energy to regain 1 HP (no action required), up to your proficiency bonus per long rest.

System Shock Protocol

When you are reduced to 0 hit points but not destroyed, you may instead drop to 1 hit point and enter emergency stabilization.

When this occurs:

• You immediately gain temporary hit points equal to your Constitution modifier + your proficiency bonus
• You may move up to half your speed without provoking opportunity attacks

Once per long rest.

Languages

You can speak, read, and write Common and one additional language of your choice.

If your setting includes machine languages or signal dialects, you may choose one of those instead.

 

Slime

Creature Type: Ooze

Size: Small or Medium

Speed: 30 feet

Ooze Nature

You don't need to breathe.

You have advantage on saving throws against being poisoned.

Amorphous

You can move through a space as narrow as 1 inch wide, provided you aren't wearing Heavy or Medium Armor.

Pseudopod

You can make an unarmed strike that deals 1d6 Acid damage instead of the normal damage type.

Mutable Form

When you finish a Long Rest, choose one:

• Gain a climbing speed equal to your Speed.
• Gain resistance to Acid damage.
• Gain proficiency in Stealth.
• Gain Darkvision out to 60 feet.

Reconstitute

As a Bonus Action, you regain Hit Points equal to your proficiency bonus + your level. You can use this trait once per Long Rest.

Slime Species

All slimes share the core traits (Ooze creature type, Amorphous, etc.), then choose a variant.

Acid Slime

Descended from corrosive dungeon oozes.

Corrosive Body

You have Resistance to Acid damage.

Digestive Touch

When you hit with a Pseudopod attack, you can change its damage to Acid. Once per turn, add your proficiency bonus to the damage.

Solvent Instinct

You have proficiency in either Investigation or Survival.

Common colors: Green, yellow, amber.

Frost Slime

Born in frozen caverns or elemental ice regions.

Cryogel Form

You have Resistance to Cold damage.

Chilling Strike

Once on each of your turns when you deal damage to a creature, reduce its Speed by 10 feet until the start of your next turn.

Frozen Adaptation

You ignore difficult terrain created by ice or snow.

Common colors: Pale blue, white, silver.

Storm Slime

Animated by lightning and magical energy.

Conductive Core

You have Resistance to Lightning damage.

Static Discharge

When a creature within 5 feet hits you with a melee attack, you can use your Reaction to deal Lightning damage equal to your proficiency bonus.

You can do this a number of times equal to your proficiency bonus per Long Rest.

Living Spark

You know the Shocking Grasp cantrip. Constitution, Intelligence, Wisdom, or Charisma is your spellcasting ability for it.

Common colors: Violet, electric blue, bright cyan.

Crystal Slime

Mineral-rich slimes that harden portions of their bodies.

Crystalline Shell

When you aren't wearing armor, your AC equals 13 + your Dexterity modifier.

Reflective Surface

You have advantage on saving throws against being blinded.

Gem Memory

You gain proficiency in one Artisan's Tool of your choice.

Common colors: Clear, ruby-red, emerald-green.

Shadow Slime

Creatures touched by darkness and the spaces between worlds.

Umbral Form

You gain Darkvision 60 feet. If you already have Darkvision, its range increases by 60 feet.

Melt into Darkness

You can attempt to Hide when lightly obscured.

Shadow Glide

Once per Long Rest, as a Bonus Action, you become partially translucent until the end of your turn. During that turn, moving through creatures' spaces doesn't count as difficult terrain.

Common colors: Black, purple, smoky gray.

Mimic Slime

Masters of imitation.

Adaptive Appearance

You can alter your coloration, texture, and minor features over the course of 1 minute.

False Face

You have proficiency in Deception.

Copy Motion

When a creature within 30 feet succeeds on an ability check using a skill you're not proficient in, you can use your Reaction to gain proficiency in that skill until you finish your next Short or Long Rest.

Once you use this trait, you can't use it again until a Long Rest.

Common colors: Any.

Royal Slime

Rare slimes with unusually powerful cores.

Noble Core

Choose one skill. You gain proficiency in it.

Regenerative Gel

When you use Reconstitute, add your proficiency bonus a second time.

Commanding Presence

You gain proficiency in Persuasion or Intimidation.

Common colors: Gold, pink, deep blue.

 

Aetherborn

Humanoid species infused with living Aether energy

Aetherborn are not born in the traditional sense. They are condensed manifestations of Aether that stabilized into mortal form—often in places where magical pressure, elemental energy, and machinery intersect. They resemble humanoids, but faint light pulses beneath their skin like a heartbeat made of starlight and steam.

Some believe they are accidents. Others believe they are the world learning to think through energy.

Creature Type

You are a Humanoid.

Aether Infused

You have resistance to lightning damage.

Additionally, you don’t need to breathe in environments filled with vapor, smoke, or magical gas (you still need air in a vacuum or underwater).

Reactive Coil

Your body can briefly vent or absorb energy.

When you take damage from a creature you can see within 60 feet, you can use your Reaction to reduce the damage by 1d10 + your Proficiency Bonus.

You can use this trait a number of times equal to your Proficiency Bonus, and you regain all uses after a Long Rest.

Aether Charge

You can store ambient magical energy.

You know the Mage Hand cantrip. When you reach higher levels, you can also cast the following spells without material components:

• 3rd level: Absorb Elements (1/Long Rest)
• 5th level: Levitate (1/Long Rest)
• 9th level: Lightning Bolt (1/Long Rest)

You use your choice of Intelligence, Wisdom, or Charisma as your spellcasting ability for these spells when you choose this species.

Overpressure Surge

Starting at 3rd level, you can overclock your Aether core.

As a Bonus Action, you enter a surge state for 1 minute:

• Your walking speed increases by 10 feet
• Your melee or spell damage that deals lightning or thunder damage gains a +1d4 bonus
• Once per turn, when you hit a target, you can push it 5 feet

Once you use this trait, you can’t use it again until you finish a Long Rest.