Iron dragon

Iron dragons, the spawn of Kritü, are a type of dragons that favor mountainous habitats, particularly where the mountains are rich in iron ore.

Biology

Iron dragons are the largest of dragon types, and also have the toughest scales. They're large, thick, and heavy, and give the impression of heavy plate armor. However, due to an ancient emnity with the Blue Dragonflight, and the resulting Rust Plague, they are prone to developing a layer of rust on top of their scales on contact with saltwater, and if left unchecked, it can fuse scales together, limiting mobility severely in advanced stages.