To get all Darth Maul on enemies, press B to brandish and wield a double-edged light saber. Press Down to put it away.”
— Description • Nintendo Power
Double-Bladed Laser Sword is a combo ability from Kirby 64: The Crystal Shards. Kirby gets it by mixing Cutter with Spark. Attacking with the blade swings it in a wide arc, protecting Kirby from projectiles fired from most angles. While the blade is out, however, Kirby can only jump once, and is not able to float. Crouching sheathes the blade.
The blade Kirby uses is a double-edged energy blade, likely a reference to the double-edged version of the Lightsaber from the Star Wars franchise. The reference is enhanced by the notable humming sound it makes as it is held and swung. Nintendo Power even noted the similarity in its description, where they described the use of the ability as "get[ting] all Darth Maul on enemies." Kirby can use this ability to gather a Crystal Shard on the fourth stage of Shiver Star, in which he needs to destroy a yellow and green part of a cage.
Kirby swings his laser sword, damaging any enemy in the slashes.
Kirby holds his laser sword behind him to protect himself.
Kirby wields a double laser sword.”
— Description • Official Strategy guide
Kirby uses a double-bladed light sword— a very cool weapon. Press ↓ to turn it off.”