Many of the items help counter the effects of special attacks made by the enemy. They will cancel the effects of the enemy attack and allow the party to better defend itself. It's a good idea to spend some time working up the meny to buy a few of these items before going on a lengthy journey such as into the Tower.
Items can be discarded by moving them to the Trash Can.
Trash Can.
Spheres
The spheres are needed in order to progress through the Tower, and they are gotten after the defeat of their respective Fiend. The sphere are used to unlock the sealed doors that will allow the party to travel further up the Tower. The Chinese writing on the spheres are Xuan (dark), Qing (blue-green), Bai (white), and Zhu (red).