Dragons

The Legendary Dragons are the peak of all of creation. They are the supreme living beings in all the brass realms, the only things beyond them are the gods themselves.
Elder dragons are the some of the only living creatures who can pick fights with Greater Demons or Angels and expect to win.

These proud creatures inhabit the wilderness, the far mountainpeaks especially. They do not mix well with civilisation and are feared and respected.

History

Dragons are ancient. Their origins are long lost to time, even to the dragons themselves. However, The Dragons themselves insist that they are a natural species, that they were not created by any god, that they never had any kings, that they bowed to none.

Dragon attacks have signifficantly shaped the culture of nearby societies, largely in the form of encouraging houses to have sturdy basements to hide in.

Nature

Dragons are superficially similar to Lizards. They have 4 legs, 2 wings, long, sinuous necks and tails. Their scales are harder than steel, their claws and fangs sharper than swords. Their roars can shatter houses and their breath weapons can devastate cities. Their minds are keen, far surpassing the average human in intelligence and they can live for countless years.

Dragons are long-distance flying predators, able to cover large stretches of land during their hunts for food.
Dragons tend to sleep for long times in-between more active periods; months or even years are not uncommon. Once they wake from their sleep they enter times of heightened activity which often spells trouble for nearby creatures, especially cattle farmers.

Elemental beings
Every dragon has a magnificent innate magical talent, their nature is so interwoven with magic itself that dragons take on traits of their environment as part of their growth.
Both their physical traits as well as their famous elemental breath is dictated by their surroundings. For example, a dragon that spends it youth in hot regions is likely to become a fire dragon in adulthood, meaning it will be immune to swelterign heat and be able to breathe flames to burn its foes to ash.
On Haven , most dragons are frost dragons, inhabiting the cold regions and the high mountaintops of the world. However there are also other kinds, such as fire dragons in the deserts and wind dragons flying over the plains and forests.

Behavior & Psychology

Dragons are apex predators, not social creatures like humans. As a result their psychology differs drastically from what a human might expect from another intelligent creature.
Dragons are used to a solitary existence and indeed tend to get irritated if they are around other creatures for too long. They can tolerate other creatures and even find amusement or utility in them but they don't have a need for company like humans do.

No dragon, not even the nicest among them, is humble. They are all some form of arrogant and they know they are better than you. They do not suffer disrespect and if they even suspect that somebody has insulted them they will fly into a furious rage.
They also do not particularly care about the opinions of anything that isn't another dragon and thus have no issue seeing intelligent creatures as food.
Though they are incredibly intelligent, dragons are incredibly prideful and they appreciate having their ego stroked. In fact, dragons need to be careful to not let their guard drop, as flatterers may indeed have untoward intentions!

Treasure
Male dragons covet treasure as part of their social hierarchy and mating rituals.
Male dragons compete for status among each-other, using their exploits, territories and treasures. Those dragons with higher status are more likely to attract female dragons and create strong progeny.
Male dragons are interested in anything rare and valuable, not due to any inherent value, but simply because they can then claim that they are superior to other males for having something that they do not.

Females also compete amongst each-other, but they mainly do so only during mating season and it takes the form of active combat rather than posturing and hoarding of wealth.

Life cycle

Youth:
A Dragon is born out of an egg, and is immediately able to innately speak their own language - draconic. They start their life immediately smarter than the average human and quickly learn to cast their first spell by experimentation.
Young dragons are most often raised by their parents, taught how to hunt and behave themselves, as well as magic, history and other skills. As they grow up, they take on the characteristics of their environment, taking on an elemental nature such as fire, ice, water, wind, stone etc. Their scales change from a dull grey to a colour and consistency matching their element after just a year or two.
Two decades after their birth, a dragon reaches maturity and leaves its nest and parents behind forever.

Adolescence:
After leaving their nest, a dragon is likely to seek an area yet unclaimed by another dragon, and try to claim is as their own. They do this by first making a great ruckus. This will attract any challengers to the dragon's claim as well as make all the local creatures aware of their new place in the food-chain.
If its attempt to claim a territory is unsuccessful, due to the territory already being claimed by an older dragon or different kind of monster, the dragon will retreat and seek its luck elsewhere.
A dragon might lay claim to an area inhabited by Humans or other sentient creatures. In such a case, it will often demand or at the very least encourage some form of regular tribute. Often times this is merely the dragon agreeing not to attack the Humans in question in exchange for regular payments of food or gold, but it may also be a promise of protection.
Adolescent dragons are the most likely of all dragons to die. They are inexperienced and have not reached their full size and are rather suddenly deprived of the protection of their parents. They are at risk of dying when trying to lay claim to territory or hunting by themselves, either to other dragons, various monsters or even Dragonslayers.

Maturity:
A dragon, once it has claimed its domain, is unlikely to move from it unless circumstances force it to. A dragon will expand their domain over time, as the dragon grows older. This may lead to conflict with other creatures in the areas of land the domain expands into. Apart from that however, a dragon will patrol within its domain and only leave in order to find a mate or to obtain treasure.
While both sexes of dragons claim territory, only males accumulate treasure hordes. Female dragons might collect shiny baubles or magic items but they do this out of mere curiosity rather than as part of building their status as males do.
Females also hold smaller territories and are significantly more likely to migrate.

When a dragoness feels the urge to reproduce, she will leave her territory and search for a mate who she deems sufficient, generally aiming for the most powerful dragon she knows in her age-bracket. She will compete with other female dragons to be that male's mate through violent combat.
If she is victorious and her competition is made to retreat to find mates elsewhere, she will join her chosen male and live in his territory. The dragoness will stay with her mate at least until the resulting young reach adolescence. Occasionally a female will bond with a male for life and not return to her territory.

Old age & Death
Dragons do not grow weaker as they age, they grow larger and become more and more powerful right until they die.
Dragons are about 10-20m long when they reach adulthood, However, Dragons can live for thousands of years and never fully stop growing. They can grow to be up to 100m long from snout to tail, large enough to crush grown men by accidentally stepping on them without even noticing.

A male dragons death, be it from time or from combat, always induces a frenzy in nearby young dragons vying for territory, as well as both dragons and other creatures making haste to claim their hoard.

Dragons, Gold & Curses

Male dragons collect various forms of treasure as part of their attempts at attracting partners. As these forms of treasure attract other creatures that want to steal that treasure, they have several methods of keeping their treasure safe. From various creatures living in symbiosis with a dragon, guarding it with spells and hazardous terrain, all the way to simply sitting on it. However dragons have some methods that are quite unique to them.
Specifically, if a dragon has spent an extended period of time near its treasure, the treasure in question becomes affected by the dragon's curse.

Dragon-Cursed Treasure: Treasure owned by a dragon will become cursed. If a thief steals it, the thief will then become a victim of that curse. The effects of the curse vary based on the dragon, but common variants include afflicting the thief with obsession, paranoia, insatiable greed or physical agony until such time that the treasure is returned to the dragon's hoard.
Notably, other dragons are immune to the effects of this curse.

Treasure Sense: The Dragon can pin-point where all pieces of its hoard are at any time, so long that the treasure is soaked with its power and curse. If even a single coin is stolen, the dragon knows and flies into a furious rage over the arrogance of whatever trespasser dared steal from it.

Lifting the curse: Treasure marked by the Dragon's curse remain cursed and can be tracked by the dragon until either they spend a significant time apart from the dragon or until the dragon dies. No attempts at dispelling the curse by use of magic are ever successful if neither of these conditions are met.
However the dragon's curse has also been known to linger over years and even decades in items of great obsession to the dragon, long after it's death.

Lesser Dragons

Apart from the so-called 'true dragons' there are several kinds of dragons across various realms that are the dragons' distant cousins.
While never quite the equal of true dragons, they are still formidable creatures. Some of these creatures can spit various elements or manipulate some measure of magic innately. They may also be decently intelligent, and exhibit similar behavior to true dragons in terms of hoarding and holding territory.

Drakes are wingless, quadrupedal dragons, comparable to large lizards. They are less intelligent but are of comparable size, strength and though they cannot use magic they have powerful breath weapons.
Lindworms are serpentine land-dwelling dragons that have only forelimbs. They are quite smart and highly venomous, but have no breath weapon, no magical abilities and cannot fly. They are potent foes even to dragons of equal age due to their brute strength and poison.
Wyverns are dragons with only back legs and wings, missing their front legs. They are great flyers but do not do well while on the ground and are not very intelligent. They also do not grow to the same sizes of dragons and are more short-lived. They are able to spit fire.
Sea-serpents are entirely water-based dragons, incapable of flight. However they are can manipulate the water around them using their innate magic.

Appearance: Dragons are reptilian with four legs and two wings. They have long tails and necks.

A dragon's appearance may vary based on its natural element. Stone dragons might have stone-like scales, wind dragons are likely to have metallic or white scales and Fire dragons have red-glowing blood, to list some examples.
Usually dragons also have horns, spikes or fins to better suit their environment.

At Adulthood (about 20 years) A dragon will be 10 to 20m snout to tail. At this point their growth slows drastically but never fully stops.
The most ancient and oldest of dragons can be up to 100m long.