Be on the lookout for Twilight Fragments
Also new to Persona 3 Reload are Twilight Fragments. These rare items are used to open treasure chests throughout the game’s dungeon, the maze-like tower known as Tartarus. You can earn these through multiple means, but they also appear in the world. You can find them in some pretty random places. The first one I ever found in the wild was inside a sink at the school. So if you see something shiny on the ground throughout the city, grab it.
