The Adamant Dragons are extremely rare but powerful mythical dragons, who are said to have a gem (an adamant) anchored in their foreheads, endowing them with nearly god-like powers. One of the most renknown Adamant Dragons is undoubtedly Ol'dem'brey, who is said to have been defeated by the young girl Katya Ileri Dain following the Vardưnnian Atonement. Kayta later on became Erpheronian queen Katya the Just for her imcomparable courage to confront the supposedly invincible dragon.