X'rphan the White Wyrm

The Frost Dragon is a high-level monster from Sword Art Online. It can be found on the 55th Floor at the top of the West Mountain. It is said to be capable of producing a rare mineral called «Crystallite Ingot», which is formed inside its body and, according to rumors, can only be obtained by a party with a master smith, however, it was later revealed that the mineral was actually found within the dragon's lair as its excrement.

Warmth of the Heart
Kirito and Lisbeth attempted to obtain a Crystallite Ingot from the Frost Dragon to forge a new sword for Kirito, but as the dragon was injured, Lisbeth came out of hiding to early and got blown away by the dragon. As Lisbeth was about to fall into the dragon's lair, a giant hole in the ground, Kirito jumped in to catch her and prevented her from taking fatal fall damage. As the lair was too deep and slippery to climb out of and had an anti-crystal field, preventing the use of teleportation crystals, the two were forced to spend the night there. After spending the night together, they managed to find the mineral, which turned out to be the dragon's excrement, buried in its lair, much to Lisbeth's disgust.

When the dragon reappeared, Kirito and Lisbeth rode on its back to escape its lair.

Frost Dragon Dragón Blanco Ледяной дракон