D&D General Interface user & Isekai.

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If you read some isekai comic you may find a special trope, the holographic screen showing game stats and working like an interactive HUD. These are used by the main characters to unlock new abilities in some talent-tree.

Those titles aren't easy to be adapted into a D&D campaign because the main characters follow a different leveling-up and usually they are overpowered for D&D standars, and the worldbuilding is relatively simple where there is only one main menace or antagonist faction, the demon king.

Some times I imagined a D&D version of isekai manga. Of course it would be with the trope of being hit by a truck, but here I would add some piece of originality. The hit wasn't an accident but intentional because ... plot twist! the truck is an evil version of Optimus Prime, leader of autobots (Transfomers franchise). When this evil Optimus Prime wants to kill some human creates something like an energy field. This teorically should work like a desintegrator ray but the true effect is more like a teletransportation toward a parallel world.

An D&D PC using a holographic HUD? This could be a class, something that would need a lot of work and time, or like a magic item.

My idea is this fantasy interface wouldn't be used for combat but other uses like crafting, building (also placing traps like in a tower defense videogame) or trading (you hunt a monster and the meat, bones and skins are teletransported toward a shop within a town). Or could be used for investigation useful to search and analyze possible clues. Or it could be used to scan bodies of sick patients to craft medicines. Or it could use genetic engineering to create plasma fruits that could be eaten by vampires.

Perhaps this interface could benefit from the help of a virtual assistant like Cortana from Halo videogames.
The interace could be used to record images and sounds, or to direct remote-control construct units.
Could you craft modern firearms? maybe, they would be a "nerferd" version and time-limited like summoned monster allies. It would automatically disintegrate if an attempt were made to disassemble it for reverse engineering, and it also requires special alloys. (In real life, a firearm could deform or even melt from overheating if fired continuously.)
If you want you could add some touch of analogic horror with some element style cursed videotape or yandere spirit who is too jealous to allow pretty females too near you.

About isekai genre I don't mind if a main character with only female sidekicks (in friend-zone) but I don't like when the MC marries several wives because in the real life would fight over the children's inheritance. If, due to polygamy, there is no custom of the firstborn being the heir, then every time a sovereign died, a civil war would break out over the succession.
 

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OK, time ago I asked Grok and now I have just asked ChatGPT a class.

CLASS: INTERFACE ARCHITECT OPERATOR
(Interface Architect / System User)

“The world is not a mystery: it is an interface waiting to be understood.”

The Interface Architect is an isekai adventurer who accesses a Personal Technomagical System, visible only to him (or projected as holograms).He doesn't cast spells in the traditional way: he interacts with the world as if it were an editable system, within strict limits.He is neither an engineer nor a pure mage: he is a system operator.

DICE ROLL d8
MAIN CHARACTERISTIC
Intelligence (system management)
Secondary: Dexterity or Constitution

SKILLS
Armor: Light
Weapons: Simple, System (class) firearms
Tools: Craftsman, calligrapher, or thief tools
Savings: Intelligence, Wisdom
Skills: Choose 3 from Investigation, Perception, Arcana, History, Stealth, Persuasion, Survival

BASIC INTERFACE FUNCTIONS (Level 1)
1. Pocket Inventory
Store non-living objects.
Capacity limited by level.
Taking/putting away items is an additional action.
2. Environmental Analysis
As an action:Scannning to try to find clues, traces, traps, and hidden creatures.
Functions as a combination of Detect Magic, Investigation, and Survival.
Does not reveal everything: displays incomplete data (“probability,” “risk”).

3. Universal Translation
You understand spoken and written languages.
It does not automatically decipher complex cultural codes.

SYSTEM MARKS (Level 2)
The class's most iconic trait.
Mark Types
You can apply Temporary Marks by spending HP Power Points:
🔹 Item Mark (Allies)
Temporarily transforms a non-magical item into a magical one.
Examples:
Boots → Jump
Weapon → +1 elemental damage
Armor → temporary resistance
Short duration (1–10 minutes or X uses).

🔻 Target Mark (Enemies)
Weakens the enemy:
Removes a resistance
Converts immunity into resistance
Applies temporary vulnerability
Reduces advantages or bonuses
Saving to resist.

⚠️ Limit
A limited number of active trademarks.
Reapplying trademarks incurs increasing costs.

CONSTRUCTION AND CRAFTING (Level 3)
You can craft entities or structures using the Interface.
Types:
Allied Constructs (automatons, light golems)
Combat Plants (roots, spores, guardians)
Structures: walls, floors, roofs, barricades
These are not permanent.They degrade, consume HP Power points, or time.

TERRAIN CONTROL (Level 5)
In combat you can:
Create elevated areas
Close off corridors
Place traps (damage, slow, control)
Tactically reshape the battlefield
Not instant or unlimited → requires planning.

SYSTEM FIREARMS (Level 6)
You can craft technomagic firearms:
They always count as magic weapons.
They do not consume spells.
They have:
a shot limit
a reload time
degradation
They cannot be copied or dismantled.

SUBCLASSES (Level 3)

1. Combat Architect
Battlefield Specialist.
More traps, offensive markings, and crowd control.
Ideal for tacticians and strategists.

2. System Invoker
Specialist in constructs and allies.
Can maintain multiple active entities.
More support synergies.

3. World Analyst
Master of research, tracking, and anticipation.
Can “predict” enemy actions.
Huge narrative bonuses.

4. Core Administrator
More PS power points, less cost.
Can modify minor system rules.
Risk of overload or corruption.

HIGH LEVEL (11–20)
Limited edition of local reality
Complex structures (temporary fortresses)
Marks that affect bosses
Crafting of legendary, non-replicable artifacts
Possibility of the System evolving… or demanding a price

IMPORTANT LIMITATIONS (for balance)
✔ Not everything is instantaneous
✔ Limited resources
✔ Interface dependency
✔ Vulnerable to mental interruptions
✔ Narrative risk (system corruption, observing entities)

ROLE IN THE GROUP
Tactical Controller
Flexible Support
Explorer and Investigator
“Living Toolbox”

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My idea is to use the marks with a game mechanic like the incarnum soulmelds. Of course it would need a lot of playtesting but that is part of the fun when you create a homemade class.
 

We already have one long thread full
of AI content. You can post your own work, but we are not going to turn this forum into an AI repository.

Thread closed.
 

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