This document provides an overview of the Avatar D20 roleplaying game system and its bending classes. It discusses the core bending mechanics including seeds, forms, ranges, and contested bending. It then provides an overview of each bending discipline: Airbender, Earthbender, Firebender, and Waterbender; outlining their class features and abilities. It also briefly introduces non-bending classes like Monk and Ranger before covering feats, skills, weapons, equipment, and prestige classes included in the system. The goal is to create a versatile bending system focused on creativity over ease of use by allowing combinations of seeds into different forms.