A.R.C.H. — Core Operations

Protect history using the RPG system you already know.

History is breaking. Events no longer match what they should be—and A.R.C.H. agents must uncover why before the timeline collapses. 

A.R.C.H. at a glance

• 🕰️ Historical time-travel investigations
• 🕵️ Mystery-focused gameplay
• 📜 System-neutral design
• 🎲 Use the RPG system you already know
• 🆓 Includes a complete free introductory mission

A.R.C.H. Core Operations is a free introduction to A.R.C.H.—a system-neutral historical investigation setting and mission framework where players become timeline investigators sent to pivotal moments in history.  

Designed around investigations rather than combat-focused adventures, A.R.C.H. combines historical settings, mystery solving and meaningful player choice into investigations where every clue and decision shapes the fate of history.

Inside you'll find:

• The A.R.C.H. setting and core premise
• The Core Operations investigative framework
• Guidance for running historical investigations
• A complete introductory mission
• Everything needed to begin adapting A.R.C.H. to your preferred RPG system

Core Operations is intentionally system-neutral, allowing you to adapt its investigative framework to the RPG system your group already enjoys. Future Adaptation Guides will provide optional implementations for supported RPG systems while preserving the same investigative experience.

Whether you're looking for historical mysteries, investigative adventures or a fresh way to challenge your players, A.R.C.H. Core Operations is your gateway into protecting history.

Product features 

• Investigate timeline anomalies across history.
• A complete introductory operation.
• System-neutral investigative framework.
• Designed for adaptation to your preferred RPG system.
• Gateway to the A.R.C.H. product line.

Product Meta

Players: 3-4

GM: 1

Play Time: Variable

Genre: Historical Investigation / Time Travel

Format: PDF

Pages: 11 (English) or 10 (Chinese) 

Price: Free 

Languages: English, traditional Chinese, simplified Chinese 

Recommended for:

• GMs who want to run historical mysteries, investigations and timeline-changing adventures.
• Groups who want a new campaign concept without learning a new RPG system.
• Players who enjoy uncovering secrets, questioning historical figures and making decisions that shape the future. 

Author's Note: A.R.C.H. was conceived, designed and authored by a human creator. AI was used during development for editorial support, formatting assistance and visual assets. The game's setting, mechanics, investigative framework and adventures were created by the author.