Chaosium

Basic Roleplaying: Universal Game Engine is the complete guide to BRP—the same system that powers Call of Cthulhu, Rivers of London, RuneQuest and countless others.

BRP’s Universal Engine is available royalty-free for personal and commercial use under the ORC license. Use these rules, and focus on creating your worlds, scenarios and even books to sell!

This book contains the core system rules, as well as character creation, advancement, monsters and antagonists, as well as GameMaster advice.

• A Seamless Core Mechanic: In BRP, success and failure are always determined by the roll of a D100. Comparing that roll to the relevant Skill, Characteristic, Ability, or Power, you succeed if you roll under the target number.
• Natural Character Growth: This means every stat on your character sheet clearly indicates to you the likelihood of success.
• Deadly and Tactical Combat: The core BRP rules present easy-to-learn and equally easy-to-teach combat mechanics that allow players to react to attacks—you don’t just have to wait for your turn in order to have an impact on combat! Conflict in BRP can be deadly, and every roll (attacking, fighting back, dodging or otherwise) is integral. This makes for a thrilling, high-octane experience with a system that does not slowdown the overall flow of play.
• Build the Game You Want: With mechanics for magic, psychic powers, mutations, superpowers, weapons, equipment, and vehicles applicable to any setting and genre, Basic Roleplaying: Universal Game Engine is adaptable to any world of your choosing—either previously established, or created from scratch.