The d20 System is the game engine used in some of the Wizards of the Coast's hobby roleplaying games. The d20 System was used as the root of the System Reference Document (SRD), an abstract version of the rules and non-rule content of the various d20 System roleplaying games from Wizards.

The System Reference Document is a comprehensive toolbox consisting of rules, races, classes, feats, skills, various systems, spells, magic items, and monsters compatible with the d20 System version of Dungeons & Dragons and various other roleplaying games from Wizards of the Coast. You may consider this material Open Game Content under the Open Game License, and may use, modify, and distribute it.

The SRD was originally developed when D&D 3rd edition and version 3.5 were published. A new version that is independent from D20 has been developed for D&D 4th edition.
  • More information on D20 and the 3.5 SRD can be accessed from the official Website
  • More information on the 4.0 SRD can be accessed from the official Website

[top]D20 and Birthright

The version of Birthright developed for the BRCS is designed to be fully compatible with Dungeons & Dragons Edition 3.5, which is based around the d20 system.

No specifications have been made by the Birthright community for the 4eBRCS or 5eBRCS as to whether they need to be compatible to the full rules for 4e or 5e or just the equivalent of the 4e or 5e SRD.

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