Dave Hargrave’s Arduin Grimoire series has been around since 1976, arguably representing the first unofficial line of third-party AD&D supplements ever. From its initial inception, the purchasing public has been deeply divided over the Arduin Grimoire series, some people hailing it as the work of a genius and others dismissing it as a set of third rate house rules. Despite this divide, the series has endured on the open market for more than twenty-nine years, undergoing multiple revisions, three printings and spawning two complete game systems of its own – love it or hate it, one can’t deny that the Arduin Grimoire series is doing something right.