Key items are essential for progressing the main story and unlocking new areas. These include items like the Mythril, Sunfire, Goddess's Bell, White Mask, Black Mask, and Crystal Rod. You cannot sell or discard key items. Quest items are similar but might be consumed or used for a specific purpose, like the Pendulum for the Wyvern. Always pay attention to dialogue that mentions specific items, as they are often clues to your next objective. The game's Word Memory system often revolves around these key items, so remember to 'Ask' about them when speaking to NPCs to gather more information or trigger events.
