Key Items are unique, story-related items that are essential for progressing through the game. They cannot be sold or discarded. Collectibles, on the other hand, are optional items that often serve a purpose in side quests or unlock special content. Examples of collectibles include:
- Kitty Dispatch Cats: Finding these cats expands your Kitty Dispatch team.
- Monster Data: Obtained by defeating new enemies, filling out your Monster Book.
- Recipe Books: Unlock new cooking recipes.
- Specific Quest Items: Items required for sub-events.
Always keep an eye out for sparkling spots on the ground, as these often indicate hidden collectibles or valuable materials. Completing your collection of certain items can sometimes lead to special rewards or achievements.