I'm new to the world of Final Fantasy XIII. I have been playing roughly 34 hours total and am on Chapter 11 in a place called the Archelyte Steppe. I've been farming CP points and was questioning what gear would be best to use on each character. My team consists of Lightning, Snow and Hope. Also can someone please explain this Upgrade system? I'm not sure if I have collected every treasure box in the game I've been following the guide on IGN for chest locations but am afraid I might have missed some and would like to get the Treasure Hunter achievement. Any advice would be greatly appreciated.