OSRIC

OSRIC, short for Old School Reference and Index Compilation, is a fantasy role-playing game system. It is a remake of the first edition of Advanced Dungeons & Dragons (AD&D), and one of the most successful Dungeons & Dragons retro-clones. OSRIC describes itself as "a compilation of rules for old school-style fantasy gaming...intended to reproduce underlying rules used in the late 1970s to early 1980s". OSRIC uses the Open Gaming License and the System Reference Document of Dungeons & Dragons 3rd edition to create a new presentation of the first edition rule set.