From publisher blurb:
Echelon Reference Series: Paladin collects information about the paladin and antipaladin classes. The base class, archetypes, mercies, cruelties (for the antipaladins), and oaths are all contained within. This book also has feats appropriate to the class and its archetypes, and there are stat blocks for NPCs of all levels and many races.
This is the PRD-Only version, containing information from the PRD.