Ruined Dragon

The Ruined Dragon appeared in 2017 video game called Super Mario Odyssey. The Ruined Dragon, also known as the Lord of Lightning, is a giant dark purple dragon encountered in the Ruined Kingdom in Super Mario Odyssey. According to Crumbleden's brochure, it is thought that the altar with the shape of his head in said location was built to talk to him or possibly confront him, with it being made to restrain the lightning. It is also implied that he is the one responsible for reducing Crumbleden to ruins. His Japanese name, "Crumbleden Dragon", indicates that the "Ruined" term in his name refers to the place he lives in rather than his physical condition.

When first meeting him, the Ruined Dragon is seen wearing a golden crown featuring the shape of Bowser's head on it, as well as various horns and a black cloth with golden motifs similar to the ones seen in Bowser's Kingdom. After being defeated, the Ruined Dragon no longer wears said crown.

Unlike other bosses, the dragon does not explode after being defeated and instead rests hanging on the tower of Crumbleden. If Mario gets on the plaza on top of it, he follows Mario with his eyes and closes them if Mario throws Cappy at them, and can even be spoken with, though he will only state that he is tired. After activating the Moon Rock, a Power Moon can also be obtained by throwing Cappy at the tip of his upper right horn.

Compared to other dragons (and most creatures in general) in the Mario franchise, the Ruined Dragon has a more "realistic" design (similar to T-Rex), with detailed textures and little cartoonish exaggeration.