- Order: Elder Dragon
- Suborder: Glitter Dragon
- Family: Unknown
- Species: Alatreon
A perfect example of a Dangerous First-Class Monster, Alatreon is an Elder Dragon feared by the gods. Though Alatreon doesn't have any known relatives, it is believed that it and Disufiroa share the same ancestors.
There is also a rumor about a Shining Blue Dragon. This monster is said to be a Subspecies of Alatreon with the ability to produce blue flames that make its white scales sparkle.
From Alatreon living isolated from all other monsters, it is hard to say where it fits in the ecological niche. Due to Alatreon living in the Sacred Land, it has changed the area into an inhospitable environment. No living things, including plants, can live in the area due to the constant weather changes that occur in the Sacred Land.
An Alatreon's average size is 3105.8cm. Known as the Blazing Black Dragon, Alatreon possesses control over the Dragon, Fire, Thunder, and Ice elements, and is said to be elementally unstable. In its scales are each of the four elements which it constantly produces, even when it is dead. However, it is unknown how its scales are able to harness the elements. If its scales weren't deadly enough, they are also extra sharp, comparable to a blade. These backward-facing scales can rip into the flesh of those that dare attack Alatreon while its shell repels attacks from enemies. On top of Alatreon's head are two large horns that can break through some of the toughest rocks. Like most other Elder Dragons, these horns seem to play some part in Alatreon's control over the four elements, however, it is unknown to the Guild if they do. Many of Alatreon's abilities seem to be unnatural, much like the Fatalis, but not much else is really known about the Elder Dragon.
Alatreon are monsters capable of destroying the world. Some locals even believe that the Alatreon is a god or demon which is transformed into an Elder Dragon.