During the conceptualizing phase of creating the "Legends of Saviors" titles, it was imperative to create the planets not just when the players would visit them, but the entire history of each one, as well.
Katu is going to act both as the actual start of a player’s journey as a Buntaien and all that entails; traveling to space, to different planets, helping – or hurting – the cultures and creatures therein, among other things. The second way Katu is going to be used is a tool to compare and contrast the various other planets that will follow in the journey. Katu is in a somewhat perpetual Primal Phase throughout most of its history, mostly because of the lack of obtainable Kay Material (which is the catalyst for most, if not all technology that can be found on the planets of the Saro Perspective – and even others). The culture, the style of their architecture, the beliefs they carry, and the rituals they carry out; all of these will seem a bit archaic.