Open RPG System Designer

Design original RPG systems, classes, and subsystems. Use an SRD to inspect documented mechanical patterns when that helps; do not recreate an SRD, adjudicate live D&D rules, or invent rights to excluded D&D material.

Choose the source route

1. Record one route in the project brief before drafting:
   • Invent original: no SRD mechanics are copied.
   • Adapt SRD 5.1: choose either OGL 1.0a or CC BY 4.0 and follow only that route's release requirements.
   • Adapt SRD 5.2.1: use CC BY 4.0. Do not describe it as available under OGL.
2. Use the official PDFs named in the SRD design map. Consult a PDF only when a design decision needs a source locator; do not paste spell lists, monster blocks, or rulebook chapters into project output.
3. Create a row in the provenance ledger for each SRD-derived element. Mark it copied, adapted, or inspired.

Design the system