. "Rules supplement"@en . "A rules supplement in 4th edition Dungeons & Dragons is a published rulebook other than the core rulebooks. Rules supplements may describe campaign settings, extend existing classes or races with new options, or describe new magic items or equipment. They are not designed as standalone products, and assume familiarity with the basic rules given in the core rulebooks. This article is a . You can help My English Wiki by expanding it."@en . . . "A rules supplement in 4th edition Dungeons & Dragons is a published rulebook other than the core rulebooks. Rules supplements may describe campaign settings, extend existing classes or races with new options, or describe new magic items or equipment. They are not designed as standalone products, and assume familiarity with the basic rules given in the core rulebooks. This article is a . You can help My English Wiki by expanding it."@en .