ThirdEra

Disclaimer: This repository and its code are primarily authored by AI. Any and all artwork in the repository is AI-generated.

ThirdEra is a Foundry VTT game system for D&D 3.5 Edition using the System Reference Document (SRD). It targets Foundry VTT v13 and provides character and NPC sheets, level-up, spellcasting, conditions, compendiums of SRD content, apply damage/healing from sheet or chat, and integration with Foundry’s core tools (combat, tokens, chat).

This documentation is generated using mkdocs and uses the torillic theme.

What you’ll find here

• Usage - Installing the system, creating a world, world configuration, and general usage guides.
• Contributing - Development approach, how to give feedback, and where to find code and commit conventions.
• Extending - Adding compendiums, modules, or new content (data-driven design, references, compendiums, config).
• Development - Contributing to the codebase (architecture, file layout, conventions, Foundry v13 notes).
• Future plans - Roadmap and planned or possible work.

Start with Usage if you’re a GM or player; use Extending if you’re adding content or packs; use Development if you're changing core code. See Future plans for what’s next on the roadmap.