From the Super Mario Wiki
Blade is a massive battleship in Super Mario RPG: Legend of the Seven Stars. Blade resembles a giant ax, with a great eye in the middle of the main blade. Additionally, two smaller axes hang from the side of the battleship. The main weapon of the battleship is a massive energy cannon that can fire the powerful Breaker Beam.
Blade is first mentioned by one of Smithy's minions, Yaridovich. Apparently, Blade was supposed to rendezvous with Yaridovich once he had his hands on the fifth Star Piece, but it did not meet at the predetermined time for unknown reasons. Jonathan Jones' pirates briefly saw Blade while Mario and Yaridovich were fighting before ultimately having to return to the sea, to which he mentioned in a note to Mario.
Later, when the Axem Rangers swipe the sixth Star Piece away from Mario inside Barrel Volcano, it arrives outside with slight tardiness. Mario manages to follow the escaping group by simply leaping onto the battleship, leading to a battle on the deck. Once each Axem Ranger is defeated by Mario and company, Axem Red activates the main cannon of the battleship, allowing him to fire the Breaker Beam at Mario's party. At the end of the battle, the cannon overloads, and the Blade explodes in a magnificent fashion.
During the ending parade of Super Mario RPG: Legend of the Seven Stars, Smithy can be seen riding in the damaged Blade.
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