Crystals are items in Kirby's Return to Dream Land. They are hexagonal pieces of glass. They are quite rare items, but some do appear in Raisin Ruins. When they are held, all walls made of crystals will become phased-out, allowing the carrier to pass through them. Also, when held, the carrier is completely invisible and invincible to all enemies, even Scarfies and Degouts, which usually track and pursue Kirby and the gang (Meta Knight, King Dedede, Bandana Waddle Dee). Crystals will respawn to their original spot if the carrier takes enough damage, or if it expires. Speaking of expiring, Crystals, much like nearly all the other Power-Up type items in the game, do not last forever and will expire over time. They will flash red as a warning sign that they are expiring soon. When the Crystal expires, all enemies will now be able to physically see the player and will proceed to chase or attack him. The Crystal is also featured in the Item Challenge.