Aevum – Free AI RPG engine for Claude with persistent factions and economy

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GitHub - RukkaNova/aevum-realm-architect: Rise from serf to sovereign in a deterministic kingdom-builder AI RPG for ChatGPT, Claude, or Gemini. · GitHub

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RukkaNova

aevum-realm-architect

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Aevum Realm Architect

Rise from serf to sovereign in a deterministic kingdom-builder that runs on ChatGPT, Claude, or Gemini.

Aevum Realm Architect is a free, two-file LLM RPG built by Arcanum RPGs. You start as a serf with one copper piece and climb — through trade, war, diplomacy, and intrigue — to the throne of a realm. Every outcome is deterministic: your preparation and planning decide battles, not dice. A tag-based economy tracks your domain, your forces, and your treasury turn by turn.

The world runs on a nearly 30,000-word Atlas covering five historically-inspired nations, named trade routes, seasonal economics, and a rigid social hierarchy enforced by the Deference Engine — the mechanic that makes your rise from serf to monarch feel genuinely earned.

★ 4.9/5 — read the full review

What's in this repo

File<br>What it's for

aevum-master-prompt.txt<br>The game engine — rules, hidden state tracking, agency protocols. Paste this into your model's instructions field.

aevum-realm-atlas.docx<br>The world encyclopedia — geography, economics, factions, law. Upload this as a knowledge file.

Quick setup

Create a Custom GPT (ChatGPT), a Project (Claude), or a Gem (Gemini).

Paste aevum-master-prompt.txt into the instructions field.

Upload aevum-realm-atlas.docx as a knowledge file.

Start playing.

Full step-by-step instructions for all three platforms — plus what to do if the game starts drifting — are in the install guide.

Highlights

The Deference Engine — a strict, enforced medieval social hierarchy. Speaking above your station as a serf has real, punitive consequences.

A tag-based economy — your domain, treasury, and forces are legible, plannable, and driven by specific tags you build or remove.

A world that moves without you — factions advance their own goals every turn, whether you're watching or not.

Deterministic combat — no dice. Battles resolve from your Retinue Power, your plan's quality, and a results table.

Five nations, five starting paths — feudal Al'thoria, Viking-inspired Njordheim, samurai Sakura, the desert trade empire of Al-Jamil, and the crumbling Shattered Republic.

About Arcanum

Arcanum RPGs is an independent directory and review site for AI-run text RPGs, and the Arcanum Originals are our own engineered games. Every Original is free to play — we design them, you play them on the AI you already use.

Full review & design notes

Design essay: the Deference Engine

All Arcanum Originals

The full AI RPG directory

Rights

This repo has no open-source license. It's public so you can read, download, and play the game for free — that's the whole point — but no license is granted to redistribute, resell, or publish modified copies. If you want to build on top of this system, get in touch.

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Rise from serf to sovereign in a deterministic kingdom-builder AI RPG for ChatGPT, Claude, or Gemini.

arcanumrpgs.com/blog/aevum-realm-architect

Topics

gemini

claude

prompt-engineering

chatgpt

ai-rpg

kingdom-builder

llm-roleplay

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