Key Items are unique, story-related items that are essential for progression or unlocking specific side quests. They cannot be sold or discarded. Examples include the Aque Blastia Core, various letters, and quest-specific artifacts. Collectibles, on the other hand, are optional items that often contribute to side quests or achievements. These include the Fell Arms, Giganto Monsters (though not items, they are tracked), and various materials for synthesis. While Key Items are acquired automatically through story progression, many collectibles require active exploration and interaction with the world. Keeping track of these can be challenging, so refer to specific side quest guides for their locations. Collecting all of them often leads to significant rewards or unlocks post-game content.
