Key items are unique, non-consumable items that are crucial for story progression or unlocking new areas. These include the Golden Orb, the Rings of Fire and Water, the Zenithian Sword, and various keys. Key items are typically obtained through story events or by completing specific quests. They cannot be sold or discarded. Always check your key items inventory if you're unsure how to proceed in the story, as one of them might be the solution to your current dilemma. The game often provides hints about where to use specific key items. Collecting all key items is a natural part of completing the main walkthrough.
