Watch `` Avatar: The Last Airbender`` on. Welcome to the Four Nations bending ball tournament! Where Bending Masters are separated from. Let's check out Ba Sing Se in the Four Nations mod for Crusader Kings II. This mod is inspired by the Avatar. Steam Workshop: Crusader Kings II. PLEASE READ: This is Part 1 of 8 Parts. This is a full conversation mod and is thus too big to be hosted on.