Dry-Bone Bowser

Dry-Bone Bowser is a skeletal transformation of Bowser, achieved when Kamek grants him a specific power-up in the "Dimension" saga. He has the ability to throw bones and breathe fire—all while showcasing the near-indestructable nature of the Dry Bones, in that each time he falls to pieces, Dry-Bone Bowser simply resurrects himself and resumes his undead form. Several times the alliance of heroes attempts to physically overpower Dry-Bone Bowser during the Battle of Dinosaur Land, but each attempt proves futile; all the while, his strength proves surprisingly intact, despite his form being sheer bones and none else. His defeat ends up being at the hands of Mario and Luigi, who simply continue attacking Dry-Bone Bowser again and again until finally slamming him against a significantly large tree, causing all of his pieces to scatter completely. Though he does rebuild himself at first, Dry-Bone Bowser quickly realizes that he is too weak to continue fighting, and so falls apart and reverts back to his normal self, much to his chagrin.