Recovery Items help Aqua regain HP, MP, and Focus during battle. Each Recovery Item is detailed below.
Discovering Maps in Treasure Chests will help fill in the Mini Map for that area. Each Map is detailed below.
Zodiac Relics are rare Items that can only be found in Treasure Chests that appear after saving a file with Clear Data (which can be done after completing the game). They are used to gain entry to the Secret Boss Rush Side Quest.