Aether

Aethers are an ancient variety of Invested entities present in the cosmere. They originate on Dhatri, where the twelve primal aethers reside, although the aethers have since spread to other worlds of the cosmere. Those who are bonded to one of the twelve primal aethers and are able to manifest that aether are known as aetherbound. Aethers have existed since prior to the Shattering of Adonalsium, and some believe that they predate Adonalsium itself or are totally independent from its creations.
All forms of aether seem to be killed by silver and salt, turning grey and losing their reactivity when they touch it. The substance they produce upon expanding also grows grey and dies when coming into contact with silver. 
On Lumar the associated substance can continue growing if more moisture is added, until it maxes out. It is unknown if that property applies to aetherbound manifested substances. While growing in such a manner, a sprouter is able to shape it by using iron to pull the material closer, and steel to push it away.
== Culture and Mythology ==
The people of the planet with primal aethers hold it as a sacred tenet that the aethers predate Adonalsium and are independent of its creations. The aethers themselves believe collectively they are the equals of Adonalsium. 
Aethers are revered by these people. They believe that aethers made all people, creating them to each think differently from one another. They also believe humans were gifted with rebirth by the aethers to encourage, bless, and uplift their fellow people. Those that follow the aethers also hold that people return to the aethers upon their deaths to reflect upon their choices in life. It is believed that people who have made poor choices are cursed to wait a long time until their next rebirth. They often swear with phrases such as "by the first aether".
On Lumar, it is a practice to use cannonballs filled with water, in order to cause further damage to enemy ships through the violent expansion of the associated substance.
== Primal Aethers ==
The primal aethers are a group of twelve sapient aethers that exist on Dhatri. They are revered on that planet and grant mortal servants a bud of their core, making them into aetherbound. Only one of these primal aethers is known, this being Silajana, the roseite primal aether.
Suna and Vishwadhar, who are referenced along with Silajana by TwinSoul, may be two other primal aethers.
They are known to be ancient and very powerful, not comparable to Shards, but still beyond the strength of most non-shard entities in the cosmere. Though they personally believe themselves to be equals in strength to Adonalsium itself.
=== Silajana ===
Silajana is the roseite primal aether, bonded to Prasanva among others. Little is known of Silajana, although he was supportive of the Ghostbloods and their work done on Scadrial countering Trell. He has sent Prasanva into exile, away from Dhatri, and would not allow him to return and risk another extermination. Prasanva's mission on to Scadrial was to gather allies and resources.
== Aetherbound ==
Aetherbound are the Invested servants of the primal aethers. They are Connected to one of the twelve aethers and granted a bud of that aether’s core. The bud at least sometimes appears as a physical change to the body of the person that corresponds with the aether they have bonded. Unlike other bonds like between spren and Radiant, each aetherbound is not Connected to their own individual aether. Instead they are all bound to the same primal aether; for instance all roseite aetherbound have a bud from Silajana.
An aetherbound can grow and manipulate that same type of aether from their bodies. They are capable of controlling the size, shape, and behavior of the aethers they produce, within certain constraints. This process requires water drawn from the aetherbound's body to facilitate the growth of the aether. The larger the mass, the more water will be required. This seems to be connected to the manner in which aether spores violently expand upon interaction with water. The effects of dehydration caused by aethers can be quickly reversed if the aetherbound drinks more water.
The manipulation of aethers by the aetherbound is mostly constrained by the size of the aether and their ability to visualize clearly what they want to produce. It takes skill and talent to produce complex mechanisms, such as producing a functional gun out of roseite.
When an aether is manifested in the Physical Realm, it can only persist if it is present in certain fields of Investiture. If these fields are not present, the aether will be dependent on physical contact with the aetherbound’s body to sustain itself. Without that contact, the aether will degrade and eventually vanish. More localized external sources of Investiture can also be set up for the aether to feed upon instead, which will allow the aether to persist without physical contact with an aetherbound. Rather than relying on water for fuel, pure Investiture can be substituted for water, allowing an aetherbound to perform more dramatic feats than would be normally possible. They are also always in contact with the primal aether that granted them their bud. The primal aethers are able to speak into the minds of their aetherbound, offering wisdom, encouragement, and knowledge. Additionally, the primal aether may be able to perceive areas where their aether is present. For instance a roseite aetherbound might grow their aether over a wall and the primal aether could describe to them what is present on the other side.
Little is known about the abilities of non-roseite aetherbound. There are twelve types of primal aether, and presumably twelve corresponding varieties of aetherbound. One must be an aetherbound to produce new aether, so physical pieces of aether are not particularly useful to anyone else. Even cosmere scholars such as those in Silverlight do not yet understand how to control them.
== Varieties of Aether ==
=== Roseite ===
The roseite aether manifests as pink-red crystals, similar to rose quartz. Generally the crystals have smooth surfaces that are occasionally marred by small pits. Aetherbound that are bonded to Silajana, the source of the roseite aether possess a bud that replaces a portion of the skin and muscle on the palm of their hand with roseite, leaving the bones of their hand visible underneath the roseite. When roseite aether is no longer being maintained by an aetherbound, it collapses into a fine rose-colored dust or powder, which eventually sublimates to a rose-colored mist. Aetherbound that are able to control roseite have fine control over a number of its attributes, including its general coloration and clarity. They have not been shown to be able to make roseite of any color, but they can control the shade of the roseite, choosing whether it appears more red or pink and whether it is transparent or opaque.
Roseite is a useful material for a number of purposes. Roseite is a strong material, resistant to gunfire, although bullets will chip the roseite when they impact it. It is useful to create items or tools that rely on the strength or structure provided by the crystal. Simple tools like creating a fountain pen nib on the aetherbound's index finger, a small knife, a pointer, or a water glass can easier be created, as well as weapons like a mace and other small structures such as chairs and ladders. As with all aethers, its maximum potential utility is directly related to the creativity, skill, and understanding of the person manifesting the roseite. A knowledgeable person can turn a map into a model of a city made of roseite, or create a functional roseite gun if they can visualize the mechanisms. Elderly aetherbound or those who have difficulty standing can use the aether to help with their stability, growing lines of aether along the edges of their joints and limbs for support. Roseite can also be grown to form a useful pair of spectacles, including with larger external magnifying lenses. Advanced uses of roseite include a juggernaut, a large exoskeleton of roseite that protects the aetherbound within the body and is incredibly difficult to bring down, even with gunfire. The body of the juggernaut is still comprised of firm crystal, but it is created with joints that allow it to move. Roseite can also form larger machines, such as an elevator if need be. These latter two examples may require so much aether that they need purified Investiture or some other source of power in order to be created or controlled for long.
=== Zephyr ===
The zephyr aether can be used as emergency propellent during space travel.
=== Spores ===
Aether spores are found on the planet Lumar, where they rain down in lunagrees from the twelve moons, forming seas on the planet.
=== Dark aether ===
The dark aether is some sort of threat present on Dhatri. It may have made the planet inhospitable for roseite aetherbound or any aetherbound. It may be related to the forces present in the aetherbound Prasanva's homeland and some sort of extermination. Prasanva has gone offworld in search of other allies to bring back to help fight this dark aether.
== Lumar aethers ==
Aethers on Lumar are an especially parasitic strain focused on self-propagation through compressed aether spores. Compared to normal aethers, these bond with their hosts far more aggressively.
They are especially unstable, with the smallest hint of water (or blood) leading to uncontrolled expansion as it pulls Investiture from the Spiritual Realm, this expansion is very rapid, comparable to lightning. Despite expanding even more when put into contact with more water, they do have a maximum extent to which they are able to grow. When they reach this maximum growth potential, they stop reacting with water and (in the case of Verdant Aether) can be safely eaten. The direction of this expansion can be changed by various factors, such as the cognitive phenomena surrounding it, shaped by thoughts and commands. It is also pushed away by steel and attracted by iron.
There are "overgrown" aethers known as prime aethers that live on Lumar's twelve moons. The prime aethers propagate themselves by creating their spores and sending them down to Lumar. Although the moons do not have water, the prime aethers still need it to survive, so they choose people on Lumar as "spore eaters". These people host a manifestation of the aether within their bodies; the prime aethers progressively drain water from them, eventually leading to death. Spore eaters are protected by the aether that they are made to gestate, which actively tries to prevent the death of its host. The method through which the water is transferred to the respective prime aether is not known.
The prime midnight aether on Lumar may be named Thanasmia, but this name has not been confirmed.
==History==
Aethers have been present in the cosmere since at least prior to the Shattering of Adonalsium, and may predate Adonalsium altogether. While they were initially native to a single world, different variants of the aethers have since spread to other planets, and now claim to have no specific planet of origin. At some point a conflict with the dark aether began on the planet of the primal aethers, which was too difficult to be defeated by Prasanva and may have led to his exile.
At some point Mraize may have visited a world containing aethers, as he has a piece of roseite in his collection. As Mraize is a worldhopper, the provenance of the roseite aether in his collection is unknown, but he is not able to make use of that piece of aether. Later his laundress Mem was tasked with removing an aether stain on Mraize's Azish cavalrylord's suit. She thought it might be a combination of oil and blood and had a great deal of difficulty removing the stain, but eventually cleaned it off without damaging the suit's delicate Mycalin dye. Mraize was surprised by her success and gave her a bonus.
Foil is trying to achieve control over the aethers. Khriss thinks that the discovery of anti-Investiture may disprove some of his theories about them.
The aethers are also relevant to the cosmere space age.
==Known Aetherbound==
* Prasanva (Bound to Silajana) - Agent of the Ghostbloods that fled to Scadrial after some sort of extermination on his home world.
==Trivia==
* Aethers originated in the unpublished novel Aether of Night. Elements of the novel have already been repurposed into other works, and it would be completely rewritten before the world is introduced to the cosmere.
* The planet where aethers originate is not central to the overall cosmere arc. Brandon has not decided how many aether novels he will write or where to fit them into the cosmere release timeline. He has considered doing a trilogy towards the end of the cosmere sequence.
* They are going to be relevant to Space-Age Cosmere.
* Aethers could develop symbiotic relationships with animals similar to the ones spren on Roshar develop.
== Notes ==
 
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