The default setting of the Legend Tabletop Roleplaying Game System is "Hallow", a post-apocalyptic fantasy world where the standard high fantasy races like elves live in small habitable domains provided by powerful and intelligent magical constructs that predate the cataclysms that ruined the world. Adventures can occur in the barren wastes between the settlements, in fertile tribal valleys, or in giant megalopolises with advanced magic and technology. Very little additional information on the setting is provided in the core book.

The rules are a heavily modified version of the d20 system. While still based on v.3.5, many of the changes are inspired by those in Dungeons & Dragons Fourth Edition, including fixed hit points at each level, paths that allow different progressions of powers in each of the classes, and special abilities granted at different "tiers". There is also a new secondary stat called Awareness, three new classes (sage, shaman, and tactician), and completely rewritten feats and spells.

This game is unrelated to Mongoose's Legend (the successor to RuneQuest II), despite both games being released at almost the same time.