Zombone

Zombone is the skeletal counterpart and second form of the Czar Dragon. After the fomer's defeat at the hand's of Mario and his party, he falls and becomes submerged in the lava underneath him, which bring's about the form of Zombone.

While Zombone has stronger attacks then the Czar Dragon, he has less defense. He is also vulnerable to thunder attacks. He no longer has the power to use fire attacks or summon Helios either.

Trivia

 * The Czar Dragons death and re-birth as the Zombone mirrors a the similar defeat of Bowser in New Super Mario Bros., and his return as a Dry Bones like creature.