|In order to defeat Dark Matter, you need the Rainbow Sword. It is said that the sword has something to do with the Rainbow Drops hiding on the islands. Will Kirby be able to save the Dream Land from Dark Matter?|
— Last Stage (vs. Dark Matter) section of the Kirby's Dream Land 2 Instruction Booklet
The Rainbow Sword is the Last Battle Ability of Kirby's Dream Land 2. It is required to defeat the evil Dark Matter, the main villain of the game. Kirby obtains it automatically after defeating King Dedede if all the Rainbow Drops hidden throughout the game have been recovered, which combine into the sword in a short cutscene.
Kirby's Dream Land 2
The Rainbow Sword first appeared in Kirby's Dream Land 2, where it can only be used in the two-phase battle against Dark Matter, the final boss of the game, and is the only weapon that Kirby can use during the fight; likewise, Kirby cannot enter the battle without possessing the sword, instead being taken to a false ending if he defeats King Dedede and is unable to obtain it. Unlike many other weapons used in final battles throughout the Kirby series, it does not shoot projectiles, but can instead be swung at the boss to cause a small amount of damage. The sword can also be used to reflect projectiles fired at Kirby if he uses it at the right moment, causing a significantly larger amount of damage to Dark Matter if he is hit by these projectiles than slashing at him would.
Once Dark Matter is defeated, Kirby briefly loses the sword as he drifts through space exhausted or unconscious, but picks it up again, using it to restore the rainbows connecting the Rainbow Islands that Dark Matter had stolen.
Kirby: Planet Robobot
In Kirby: Planet Robobot, the Dark Matter Clone wields a sword that occasionally emits a rainbow glow. This sword is materialized from Dark Matter’s memories of the Rainbow Sword from back when he battled it in Kirby's Dream Land 2. The reason he materialized the Rainbow Sword is because he felt Meta Knight's great power and materialized the power of the sword to counter him.
- The Rainbow Sword is the only final weapon that does not have a ranged attack of its own. However, it can still be used to deflect Dark Matter's projectiles back at it.
- Since Kirby's Dream Land 2 was developed for the black-and-white Game Boy, the Rainbow Sword doesn't actually appear rainbow-colored unless playing the enhanced Super Game Boy version.
- "In order to defeat Dark Matter, you need the Rainbow Sword." –Kirby's Dream Land 2 manual (page 25)
- Kirby: Planet Robobot Drawing and Screenshot Challenge winners