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Master is a Copy Ability in Kirby & The Amazing Mirror. It is obtained by wielding Meta Knight's sword, Galaxia, provided by him just before the final encounter with Dark Mind, and is left behind in the Central Circle after the game is completed.

Properties
Master is similar to the Sword ability at first glance, but bears key differences in its move-set. With nine separate moves, it is by far the most complex ability in Kirby & The Amazing Mirror. Using the ability, Kirby can thrust upward to attack airborne opponents, throw beams using Final Cutter and Sword Beam, light fuses using sword swipes, fly forward and bust metal blocks using Drill Rush, and pound stakes using a downward Stab.

Kirby gains no hat or other costume piece when using this ability, but the sword itself glows with a strong golden light. The Master sword itself is strongly implied to be Galaxia, but is not explicitly named as such, and does not resemble the sword in shape. While Kirby gains the Master ability to battle Dark Mind at the end of the game, the use of the ability is not required to defeat him, and the ability can be lost at any time, unlike other Last Battle Abilities in the Kirby series.

Kirby & The Amazing Mirror
This is the Master ability's first game appearance. After Dark Meta Knight is defeated, a large vortex appears that leads to the lair of the game's final boss, Dark Mind. As the Kirbys jump into the vortex, the real Meta Knight, who is present, throws in his sword to help the Kirbys. When the Kirbys land in Dark Mind's lair, the sword is there, plunged into a pedestal in the ground. When Kirby touches the sword, he automatically gets the Master ability.

Master is the strongest ability in the game. The ability can solve every puzzle in the game except for those that require Mini Kirby.

After beating the game, the ability becomes available in the Central Circle.

Kirby: Triple Deluxe
The sword makes an appearance as a rare keychain, specifically in Lollipop Land - Stage 2. The item is labelled as the Master Sword.

In Kirby: Right Back at Ya!
In the episodes Hour of the WolfWrath and Crusade for the Blade in Kirby: Right Back at Ya!, Kirby wields Galaxia as a stronger variant of Sword.

Trivia

 * In-game, the jewel on the hilt is red. However, official artwork erroneously shows the jewel as blue-green.
 * Its name may be a reference to the Master Sword from The Legend of Zelda series.
 * Master is one of the few abilities in the series to have two different inputs for the same move (Final Cutter in this case).