If a bonded dragon dies, so does their rider; if a bonded rider dies, the dragon may be harmed but will ultimately live. Once bonded, it's for life, as a failed bond is often fatal to the rider. The rider will gain usage of their dragon's magic and their mental state will be connected, with strength usually growing over time. Bonds are often stronger after a dragon and their companion spends time with each other for months or years and proper connection is established outside of the bond.
Weak bonds will give the human a small amount of magic and a slight telepathic connection, while a strong, complete bond can change the rider irreparably, including physical and mental alterations.
Magic given through a bond typically imparts something related to the dragon's magic and being. A bonded Warden, for example, may impart strength and shielding to their rider. Magic is typically unpredictable if the dragon has not specialized in anything; most humans (and their dragons) study in the Aetherial Academy to learn how to use their magic.
Bonded dragons are capable of changing their body into that of another living entity, though their eyes always stay the same. This process is known as Soul Incarnation.
The main empire is a continent-spanning society known as the Radiant Empire. Its ruler, the Radiant Queen, is immortal. Its major export is foods and lumber as they have a rather temperate environment ideal for farming. The southern mountainous region has a majority of the world's Emperor societies. The Radiant Empire is regarded as quick to ally and promote the study of magic and personal education.
The Scorched Empire resides in the Scorching Wastes, an isolated location set apart from the world after a war-ending barrier was constructed around it. Most civilizations in this place live underground. The empire is seen as quick to threaten with its large weapon industry. A lack of magic is typically discriminated against within the empire; the capital highly prefers elementalists rather than any other kind of magic. The city itself has a high crime rate.
The Frigid Empire is in the Frigid Realm, which mirrors Alaskan climes. At its heart is a temple dedicated to the origins of the Radiant Empire. Both empires are seen as allies. Expansive underground tunnels- some hand-dug with hot springs and greenery or catacombs for the deceased- span underneath the tundra.
The Shimmering Isle Empire, or the Dead Empire, was a society in the now-called Deadlands that had a constructive rivalry with the Radiant Empire. It fell during the Aether Wars.
The Gloom Empire resides in a swamp and is where pseudo-dragons originate from. Many cities sprawl within the swamps. A major export is lumber and minerals, though natives often do not leave. Magic users are discriminated against, speculated to be because of the fall of the Shimmering Isle.
Existing as a mirror world to the Above, the Below is the source of power dragons and other beings draw their magic from. It's a very dangerous, corrupt world that humans can almost never traverse. No edible food nor drinkable water exists in the Below. It resembles an inverse of the Above with ruined reflections of existing structures and ley lines that cause unnatural formations and altered gravity in various places. Most beings within the Below, such as aemons, desire power for their own gain and will attempt to consume anything uncorrupted. Dragons who make a residence in the Below will typically be corrupted.
The Below is separated from the Above by a phenomenon known as the Veil. The Veil serves as an afterlife keeping the Below from merging with the Above. Only the dead or dying can reside in the Veil; all others must only pass through it to get to either side, often at highly guarded locations where it's weak enough to do so. Necromancy and immortality is frowned upon, as it's believed that without death, the Veil would not exist.