Third kingdom Games presents supplements for use with Old School Essentials. While written for Old School Essentials, the system contained within is easily adapted to other rulesets.

Old-School Essentials is a role-playing game of fantastic adventure, monsters, and magic.

Simple, robust rules: Light, easily modified rules put the focus of play on shared imagination, improvisation, and fun.

Easy to learn and reference: Modern formatting and layout make the game easy to learn and a breeze to reference during play.