Dry Bones

'Dry Bones (カロン, Karon, Karon) are a species of undead Koopa in Nintendo's Mario series of video games.

Dry Bones are the skeletal remains of Koopa Troopas that have been re-animated. They are immune to most of Mario's attacks and will fall apart when stomped on, only to reassemble moments later. However, they can be defeated with certain special attacks (such as with the Cape Feather, Hammer Bros. Suit or Starman). Dry Bones usually prefer dark places, mainly castles, but have been known to live in other areas like the desert or sunken ships.

According to Goombella's Tale in Paper Mario: The Thousand-Year Door, Dry Bones are former Koopas whose spirit animates its bones.