Dragon

"Dragons all possessed their own immense power, and lived freely according to their own will. Now, the fate of the world was dominated by dragons."

- Azazel

The Dragons are a race of ancient and powerful reptilian monsters that are both feared and admired in the supernatural world. They are among the top of the power hierarchy and are featured in mythology and folklore of various different cultures.

Overview
"Dragons are some of the most powerful beings in the supernatural world, some of them are said to be rivalling that of the gods themselves."

- The Infernal Compendium

A dragon is a large, serpentine, legendary creature that appears in the folklore of many cultures worldwide. Beliefs about dragons vary considerably through regions, but dragons in western cultures since the High Middle Ages have often been depicted as winged, horned, four-legged, and capable of breathing fire. Dragons in eastern cultures are usually depicted as wingless, four-legged, serpentine creatures with above-average intelligence.

The earliest attested reports of draconic creatures resemble giant snakes. Draconic creatures are first described in the mythologies of the ancient Near East and appear in ancient Mesopotamian art and literature. Stories about storm-gods slaying giant serpents occur throughout nearly all Indo-European and Near Eastern mythologies.

Commonalities between dragons' traits are often a hybridization of avian, feline, and reptilian features, and may include: snakelike features, reptilian scaly skin, four legs with three or four toes on each, spinal nodes running down the back, a tail, and a serrated jaw with rows of teeth. Several modern scholars believe huge extinct or migrating crocodiles bear the closest resemblance, especially when encountered in forested or swampy areas, and are most likely the template of modern dragon imagery.

Summary
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Appearance
Dragons are monsters with reptilian traits and are usually distinguished by the color of their scales, as they usually represent what a Dragon's true nature is. The scales themselves are extremely durable but will become significantly more flexible after they fall off a Dragon's body, enough to be made into various items of armors and clothings.

Dragons with a treasury tendency usually have scales in metallic colors such as gold and silver to signify what kind of treasures they tend to hoard, as the brighter and more metallic a Dragon's scales are, the more treasures are kept in their den. Dragons with a more violent and battle-hungry tendency, however, have solid and non-reflective coloring of their scales, usually in the color of their elemental breaths, as most Fire Dragons tend to have dark-red scales while Sea Dragons have a sea-green variation.

In addition to that, Dragons can also be separated into two physical types of Dragons, based on their general appearance, and not regional or geographical like in popular beliefs. They are:
 * Western Dragons ( ウエスタン・ドラゴン, Uesutan Doragon ) are a lizard-like creature that stands on four legs, leathery or bat-like wings growing from their backs, and a long, muscular tail. Their scales are typically oval or round-shaped and are, despite its rough appearance, surprisingly smooth to the touch.
 * Eastern Dragons ( イースタン・ドラゴン, Īsutan Doragon ) are typically portrayed as serpentine creatures that have long, slim bodies with four legs, and without wings. Their scales are typically diamond-shaped and have a particular sheen to it reminiscent of polished metal, even if their scales are chromatic in color.

Characteristics
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Abilities
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Dragon Gate
The Dragon Gate is a magic circle exclusive to the Dragons, which allows them to summon other Dragons to their side. While the Dragon Gate insignia can be drawn by someone else, it will only respond when there is a Dragon nearby. It requires 3 or more Dragons of the same class in order to forcefully summon a Dragon of a higher class.

Despite this, there are also other methods that can be used to open the Dragon Gate, such as using the combined spiritual and magical energy of the leylines or the blood of a Dragon King or higher as a conduct. Individuals who specialize in Summoning Magic and have made a Dragon their familiar can also learn to use the Dragon Gate to summon the Dragon which is their familiar.

Ranking

 * True Dragon ( 真龍, Shinryū ) is a class remains exclusively for Great Red, the True Red Dragon God Emperor who is known as the "Dragon of Dragons" (DxD). According to Ddraig, it is the title reserved for the most powerful of all Dragons. While Great Red is the only Dragon belongs to this class, Issei could be thought of as a small True Dragon because of having his new body made from Great Red's flesh.
 * Dragon Gods ( 龍神, Ryūjin ) is a class reserved for the original Dragons created by Lucifer during the Heavenly War, with Great Red being the eldest and leader of the group. They are the creators and ancestors of the Dragon-kin, as all known Dragons are descended from the Dragon Goddess Tiamat. They are worshipped and revered by all of Dragons kind in the same manner as the pagan gods to humanity, with the religion they belonged in is known as Deus-Draconism.
 * Heavenly Dragons ( 二天龍, Nitenryū ) is a class reserved for the exceptionally powerful Dragons whose power rivaled that of the Primordial Gods. According to Ddraig, due to a conflict between the Heavenly Dragons in the past, most of them were eradicated and their soul sealed into Sacred Gears.
 * Dragon Kings ( 龍王, Ryūō ) is class reserved for Dragons with power rivalling that of gods. They are the leader of the Dragons living within their territory, who are often treated as their "children", and are responsible for maintaining peace within the race as a whole. Many Dragon Kings were once worshipped as deities along side genuine pagan gods by humans during the Age of Gods.
 * High-tier Dragons ( 一等龍, Ittō Ryū ), are Dragons of Ultimate-Class magical power. They often serve as subordinates for the Dragon Kings.
 * Middle-tier Dragons ( 二等龍, Ni-tō Ryū ) are Dragons of High-Class power and consists of over 80% of the Dragon population.
 * Low-tier Dragons ( 三等龍, San-tō Ryū ) are Dragons of Middle-Class power. Most of Dragons within this category are considered children in other Dragons eyes, being significantly younger, and thus weaker, than the rest of them.
 * Lesser Dragons ( 獣龍, Kemono Ryū ) are the lowest and weakest of Dragons within the Dragon hierarchy, solely used to refer to the non-sentient Dragons born from the excess energy from High-tier Dragons. These Dragons possess no form of human intelligence and are considered more "beasts" than "creatures" like the rest of the Dragons. These Dragons are usually raised and kept by magic-wielders world-wide, both as pets and as sources of rare ingredients for their potions, spells, and rituals.
 * Evil Dragons ( 邪龍, Jaryū ) is a class reserved for the most vicious and brutal of all Dragons, all of them being dangerous battle maniacs that want to destroy everything including themselves. They are considered "Broken Dragons" and are feared by all the factions of the supernatural world due to their immense power and extremely savage brutality. They are considered nearly impossible to control as only Evil Gods were able to control them in the past.

Lesser Dragons

 * Antipodean Opaleye
 * Catalonian Fireball
 * Chinese Fireball
 * Common Welsh Green
 * Cuélebre
 * Dracosphinx


 * Drakon
 * Guivre
 * Hungarian Horntail
 * Hydra
 * Lionturtle
 * Norwegian Ridgeback


 * Peruvian Vipertooth
 * Portuguese Long-Snout
 * Romanian Longhorn
 * Scalamagdrion
 * Swedish Short-Snout
 * Ukrainian Ironbelly

Trivia

 * It has been stated several times that Dragons and those who possess draconic Sacred Gears are able to naturally gather friends and foes, in addition to being able to attract potential mates - both men and women alike - and easily form harems.
 * Young Dragons are required to eat a special fruit called the Dragon Apple in order to grow up strong and healthy. However, due to all of the Dragon Apples on Earth have been destroyed due to climate changes, the only remaining source of Dragon Apples are located in the Buné Clan's territory.
 * According to Tannin, the Dragon Apples is one of the reasons he became a Devil.
 * They have a disease called the Dragon Flu, which users of draconic Sacred Gears can also catch.
 * Due to them being living embodiments of power, those who spend extended periods of time around especially powerful Dragons have, on multiple occasions, undergone changes in their powers, potential, and growth; which extends to their blood causing potent affects on other beings who ingests them.
 * The concept of Outrage comes from the "gekirin" (逆鱗), the one inverted scale among the 81 of an Eastern Dragon that will enrage it if touched.