Spira: Besaid is a map/mod for Battlefront 2 that brings a level of gameplay previously unseen to the game. Instead of a first-person shooter, Spira: Besaid is an RPG/Action-Adventure game. It features many "rarely seen" or "firsts" into SWBF2, including: Full RPG mode (gameplay 2-4 hours), Final Fantasy music, leveling-up system, weakness/resistance system, game save function, interactive puzzles (not just battling), and multiple sidequests. It also features, as a bonus mode, KotOR conquest. While unrelated to RPG mode and only a small part of this, KotOR conquest is unique in and of itself. It includes full KotOR sides with custom KotOR heroes (as seen in previous maps Sullust: Jedi Conclave or Ralltiir: Swoop Circuit) and has AI Hero functionality. Much more information about this mod may be found at Gametoast.com
This explains the workings of some of the more-detailed-functionally aspects of the mod, like the save feature.