Pathfinder Unchained is a 1st edition Pathfinder RPG rulebook offering optional, streamlined, and rebalanced rules, focusing on revising classes like the Barbarian, Monk, Rogue, and Summoner. It also introduces modular systems including Skill Unlocks, variant magic, and streamlined combat mechanics to customize gameplay.
You can find more detailed information and the full range of rules on the PathfinderWiki page for Pathfinder Unchained and through the Stellar Dragon Games guide to the Unchained Barbarian . PaThfINder UNcHaINed PaTHfINder UNcHaINed PaTHf...