Darkeyes

On the planet of Roshar, a darkeyes is a person with dark colored eyes, such as brown or black. In the Vorin kingdoms of Alethkar, Jah Keved, and Kharbranth, they are the commoners, considered inferior to the lighteyes. Darkeyes are ranked in ten different levels, in accordance with the nahn caste system.
== Overview ==
According to the Vorin religion, all lighteyes are born to rule and are superior to the darkeyes, leading to a class system based on eye color. Although darkeyes are always socially inferior to lighteyes, high-ranking darkeyes can actually be more influential and wealthy than a low-ranking lighteyes. A darkeyes of one of the higher nahns is even permitted to wed a lighteyes of a lower dahn.
A darkeyed person is anyone who has dark colored eyes, typically brown or black. However, this can also include other colors if they are dark, muddled, and hard to distinguish from brown or black.
Darkeyes are generally skilled laborers.
A wealthy and high-ranking darkeyes (of the first or second nahn) is addressed by the title Citizen. Darkborn is a term used to address a darkeyed person, though it is used very rarely. Darkborn is used only by a higher ranking lighteyed person addressing a darkeyed person, and its usage seems to imply either contempt or an obvious difference in status.
== Changing eye color ==
Permanently changing one's birth eye color is generally not possible. However, two exceedingly rare methods are currently known to change one's eye color.
It is a well-known legend within Vorin society that if a man wins a Shardblade on the battlefield, he will become a lighteyes, regardless of his previous station in life. This would also be accompanied by a promotion to the fourth dahn for the Shardbearer. This legend, though a foundation of Vorin society, goes untested for centuries, until Kaladin Stormblessed wins a full set of Shards and gifts them to his lieutenant, Moash. After bonding the Shards, Moash's eyes lighten from a dark brown to a light tan. This effect is not irreversible, as Moash's eyes later darken again after losing his Shardblade.
A second method of becoming a lighteyes is to become either a Surgebinder or Knight Radiant. According to Skar, Kaladin's eyes changed while fighting to save Dalinar during the Battle of the Tower, although it was only for a short moment, as other men still recognize him as a darkeyes during the fight. During this battle, Kaladin only said up to the Second Ideal of the Immortal Words and did not recognize himself as a Knight Radiant. Later, during the Battle of Narak, after Kaladin says the Third Ideal of the Immortal Words and recognizes himself as a true Knight Radiant, his eyes turn pale blue, lighter than any king. A Knight Radiant's eyes will rapidly lighten when they summon their Shardblade -- once their blade is dismissed, their eyes will fade back to their natural color within a few hours.
== Origins ==
It is speculated that the distinction between lighteyes and darkeyes stems from the Knights Radiant. The Knights Radiant all used Surgebinding and Shards, which granted them light-colored eyes even if they didn't have them at birth. Because the weapons and magic that the Radiants wielded were so superior, the belief that light colored eyes being superior to dark colored ones came to be.
Hoid thinks that he should be amused by the import given to the color of one's eyes, but he isn't, since he has seen other arbitrary systems of governance; additionally, he recalls that there is a good reason why the belief in the superiority of the lighteyes came to be.
== Nahn ==
Nahn is the caste system for darkeyes. Its counterpart for lighteyes is the dahn system. 
Since darkeyes are the "commoners" in the Vorin kingdoms, the nahn system is inferior to the dahn system and holding any level of nahn would be socially inferior to the lowest level of dahn. However, there are situations in which circumstances makes the social standing between two persons less relevant or even reversed. For example, after Kaladin, a darkeyes, was promoted to captain, he was socially outranked by many lighteyed soldiers yet still possessed higher military rank and authority than them. A worker, such as a carriage driver, would treat a wealthy darkeyes as any other master since their wages would be paid by the darkeyed passenger.
Within the nahn system itself, there are ten different levels ranging from one to ten, with one being the highest and ten being the lowest. Those at the highest levels of nahn enjoyed relative comfort and wealth while those at the lowest levels of nahn would be serfs restricted from being able to freely travel. Finally, those of the tenth nahn are slaves and can be bought and sold by others.
At the first and second nahn (the most prestigious nahns), one is even capable of marrying into a lighteyed family. These two nahns are confirmed to be full citizens with the right of travel. 
While those at the lowest level of nahn without the right of travel are essentially serfs tied to the land they are currently on, this is relatively rare. Many more people are at the slightly higher levels of nahn that include the right of travel.
=== Protections and privileges ===
There are some protections built into the system of nahn to prevent abuse by lighteyes.
The first is the right of travel, which is assumed to be included with most nahns. To not possess that right would imply that one or one's ancestors had committed some wrongdoing. The right of travel allows a darkeyed person to leave a town being ruled poorly by the citylord. If the town experiences a substantial loss of persons, the citylord may be stripped of his position and be demoted in dahn. This protection was suggested by the Herald Nale when he was aiding scribes in writing the law as pertaining to eye color.
The second known protection is exemption from military conscription for those who are of sufficient nahn and provide an essential function to a town. It is known that a second nahn surgeon and his only apprentice, also of second nahn, are exempt from military conscription.
A third known privilege is the right of Commission. In Highprince country, a darkeyes of high enough nahn could get a commission to work an unused hill or section of land and then keep a portion of the crop for themselves or their family. Not every darkeyes is allowed to sit at a lighteyes’ table, even if they have a personal invitation, but those of the second and likely first nahn can.
=== Moving between ranks ===
Moving between ranks is a fairly fluid and common occurrence, except for the very highest ranks, which are harder to attain. The structure of the nahn system pushes people towards "stable ranks," which are ranks in which the child automatically inherits the same rank as their parents. 
Joining the army is one way to permanently increase the nahn of a person and their children; for example, if a very low-ranked darkeyes joins the army, he would likely receive an immediate one nahn increase. Another way to increase one's nahn is to buy yourself up a rank, although this only works at the lower ranks of nahn.
There is an extremely rare method to change ranks out of the nahn system and into the dahn system. By becoming a Shardbearer, regardless of how the shard was obtained or whether one is darkeyed or not, one immediately raises his rank to the fourth dahn. This was accomplished for the first time in generations when Moash received a full set of shards from Kaladin Stormblessed.
=== Inheritance of nahn ===
The nahn of a darkeyed child is influenced by the nahn that his parents hold. Generally, the child's nahn will be equivalent to the highest nahn that either of his parents hold. For example, a child from a union of a fourth nahn husband and fifth nahn wife would be fourth nahn.
However, for those of very high nahn, the children might slip down in rank until they hit a stable rank.
== Notable darkeyes ==
=== First nahn ===
* Bashin, Huntmaster
=== Second nahn ===
* Lirin, surgeon of Hearthstone
* Muri, former seamstress of Kholinar
=== Sixth nahn ===
* Gaz, sergeant of Highprince Sadeas's bridgemen
== Notes ==
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