From publisher blurb: Do you love B/X Essentials, Moldvay’s version of the World’s First RPG, and Labyrinth Lord? Do you also love some of the innovations from later edition of the First RPG? B/X Ascending is a supplement for B/X Essentials that focuses on unifying the game to a roll-high d20 mechanic based on classic saving throws. It updates the Classes while keeping Race-As-Class, and adds Paladins, Monks, Rangers, Illusionists, and Druids. It includes Trained and Untrained Skills and treats them as Saving Throws, it uses Ascending AC, and Attack Bonuses. B/X Ascending aims to keep the best parts of B/X Essentials while adding some of the modern ideas we’ve all grown to love. For those curious about B/X Ascending, I know it sounds like I just injected the d20 system into it, but I chose to focus the unified mechanic on the classic saving throw. There are no DCs set by the Referee. Each class and race ability has a target number, just like saving throws in B/X. Additionally, Trained and Untrained Skills are now Saving Throws.