Lost City of the Dwarves Part 1: Discovery

From publisher blurb:

The first book in a new choose-your-own-adventure series with a refined OSRIC-compatible adventure system (old school d20 RPG) that has a minimal learning time but covers the most used aspects of old school gaming. In no time you’ll be hunting for enchanted items, battling goblins, rat-men and other creatures, enhancing your combat with a variety of potions and solving puzzles with deadly traps. Best of all, the character that you create, level up and spend time building in this adventure can be used continually in all of the Path of Legends books as you travel the path to becoming a living legend.