X'rphan the White Wyrm

Frost Dragon is a monster from Sword Art Online. It can be found on Floor 55 deep within the West Mountain. It is said that to produce a rare mineral called Crystallite Ingot which is formed inside its body and can only be obtained with the presence of a master smith. Kirito and Lisbeth attempted to obtain Crystallite Ingot to forge a new sword for Kirito, but the Frost Dragon proved to be quite dificult to fight and were both thrown inside its den which proved to be too deep to escape. After spending the night together inside they managed to find the mineral which turned out to be the dragon's excrement. When the dragon reappeard Kirito and Lisbeth rode on its back and used it to escape its den.