Dry Bones Shell

The Dry Bones Shell is an item in Super Mario Maker 2, available in the editor as an alternate object to Dry Bones. Unlike Buzzy Shells and Spiny Shells, Dry Bones Shells are upside down and cannot be worn on the head. Instead, they can be worn by Mario in a similar way to a Goomba's Shoe and are used to float across liquid hazards (including lava and poison), ground pound, and become invulnerable temporarily by turning into a pile of bones. Additionally, they can be kicked, though they break upon hitting a wall.

The Dry Bones Shell is the only possible means of Ground Pounding in the Super Mario World game style.

In the story mode, Undodog gives Mario the job Swamp Escape by Shell!, which when completed gives Undodog a big Dry Bones Shell as a doghouse. Another job called Secret of the Dry Bones Shell focuses on the shell as well.

Even though there are Dry Bones in the Super Mario 3D World style, the Dry Bones Shell is not available in that game style.

Super Mario Maker 2

 * North American website bio: "Even lava doesn’t faze the Dry Bones Shell. Play dead for a sec and you’ll be temporarily invincible!"