Deadeye

Deadeye spren are spren who were bonded to Knights Radiant and were killed when their oaths were abandoned.
== History ==
Deadeyes did not exist before the Recreance. What happened to spren whose Radiants abandoned their oaths prior to the Recreance is unknown. The Radiant spren became deadeyes when the Radiants willingly abandoned their oaths to stop the future of a destroyed Roshar from coming to pass. Honor had sent them visions of this occurring. The release of Ba-Ado-Mishram sent all deadeyes on the resurrection process, though it does not fully heal them.
== Creation ==
A spren becomes a deadeye when the Surgebinder they've been bonded to breaks their Oaths. It requires the Surgebinder to have previously sworn a sufficient number of them for the spren to manifest as a Shardblade -- if the breaking happens earlier, the spren appears to simply vanish. Regardless, the process causes the spren significant pain.
Shattering the Nahel bond breaks something in the Spiritual aspect of the spren. Even broken, however, the Oaths continue to affect it, locking it in the form of a Shardblade and preventing it from returning back to the world.
Highspren are immune to becoming deadeyes. This is because they emotionally distance themselves from their Radiants, so when the bond breaks it does not hurt them as much. 
== Appearance ==
In the Physical Realm, deadeye corpses are Shardblades. There are several differences between dead Blades and living ones -- they do not glow, they are incapable of changing their shape, and they require a gemstone to be inserted in order to be bonded. They also need ten heartbeats before appearing, as opposed to materializing immediately. Moreover, when a dead Shardblade is dismissed, a deadeye spren doesn't appear in the Physical Realm the way a living one does, but rather remains in Shadesmar.
They can be any type of Radiant spren, with Mayalaran being cultivationspren, Testament being a Cryptic, and Captain Ico's Father being a Reacher. Their eyes appear to be scratched out, though not like empty eye sockets, but rather like a painting that's been defaced. Presumably, it's this that the name "deadeye" came from.
Becoming a deadeye leads to other changes in a spren's appearance as well. Live cultivationspren are made of green vines, but Maya's vines are ashen brown, dried-out, and more tightly woven. Deadeye Cryptics' head patterns cease moving and become twisted and jagged; though they don't have eyes to begin with, the same scraping effect appears in the center of the pattern.
== Behavior ==
Deadeye spren cannot talk, only screech. They scream when someone attempts to summon them. In the Physical Realm, a Surgebinder who touches a deadeye Blade will hear it shriek. Someone touching the Blade alongside a Surgebinder will also hear the screaming, which will apparently continue for some time after the Surgebinder lets go.
In Shadesmar, deadeyes are generally placid and unresponsive. If left to their own devices, they'll try to reach the location of their Physical form. They also seem to feel attracted to the people their Blades are bonded to. In their desire to reach their goal, deadeyes ignore any obstacles in their way, which can be problematic when, for example, they waltz right into a sea of beads. Fortunately, it's easy to prevent them from movement -- Mayalaran only requires her hand to be held, and Ico locks his father up in a cargo hold.
A deadeye retains some small level of consciousness; however, it's unclear just how much sapience they have. While they usually seem dull to external stimuli save their desire to reach the Blades, there have been several cases of deadeyes showing higher awareness of their surroundings. Oathbringer's spren is aware of who holds it, and can discern Dalinar from others, reacting differently to him. Mayalaran, in turn, follows Adolin around and tries to protect him.
The Shadesmar location of a deadeye relative to the Physical location of its Shardbearer does have a minuscule impact on the speed at which the Blade is summoned. It seems that to become a Shardblade, the deadeye travels to the desired location at the speed of light, or something approaching it.
== Resurrection ==
Deadeye spren can be at least partially revived. They are only truly revived if the person who broke the oath were to reswear it or if the Shardblade could be filled with Stormlight and fixed in the Spiritual Realm. Mayalaran, Adolin's deadeye Shardblade, regains consciousness during Adolin's trial by witness in Lasting Integrity while under extreme emotional duress. 
Once partially revived, a former deadeye spren does not return fully to their pre-deadeye form. In the case of Maya, her face remain scarred, but she is able to speak and she has eyes again. Her thoughts and speech seem slightly slow or off, but appear to improve as time advances. Reviving a deadeye does not create a Nahel bond between the deadeye and Shardbearer, though Adolin notes that he can sense Maya's emotions and awareness, which is not part of a Nahel bond. 
In the case of Maya, she began to exhibit signs of consciousness a year before being revived. She attacked both Fused and Tukari to protect Adolin's life, and gave him her name as a thought. Adolin interacted with Maya in a tender way, speaking to her as part of his dueling ritual and treating her as a person when in Shadesmar; this may have contributed to their Connection, encouraging the resurrection. By performing katas with her each day as a Shardblade, Adolin was able to teach her the movements and perform the same movements in Shadesmar. 
Spren of all types believe it impossible to revive a deadeye. Before Maya was revived, spren who Adolin told of Maya's behavior assumed that he had trained her to act in such ways, which suggests that it may be possible to train deadeyes to perform certain tasks. When confronted by such behavior, or when being told of her speaking to Adolin, almost every spren replied with the same word: "Curious." When Dalinar inquires about bringing Oathbringer's spren back to life, the Stormfather states that he knows of no way to do so. Pattern, on the other hand, speculates that if the original Knights Radiant who had broken their Oaths and killed them were still alive, it might be possible for a deadeye to come back. If the person who broke the Oaths re-swore them, the spren could return; however, a different person swearing the same Oaths would not be enough. It is likely that a large quantities of Stormlight would be an important, but not key element of the process.
== Unoathed Bond ==
Deadeye spren may form a connection with a Shardbearer, called an Unoathed. This appears to only happen with deadeyes who are on the path to healing. This is not a Nahel Bond, merely a personal connection between them. The deadeye may move through Shadesmar, but returns to their corpse if the Blade is summoned. The deadeye and Shardbearer are able to telepathically communicate this way, but if the deadeye is farther away in Shadesmar, it is harder for them to speak. 
Mayalaran and Adolin were the first to bond in this way, and used their abilities to assist in the Battle of Azimir. During the Night of Sorrows, Maya brought other deadeyes with herself, connecting with the nine other people there to make them Unoathed and giving them each Blade and Plate. It seems that deadeyes have the ability to teleport the manifestation of their body in the Physical Realm, but only if they have faded from the collective consciousness. This could happen due to being lost at sea, among other reasons. 
== Notable Deadeyes ==
*Mayalaran
*Testament
*Vienta
*Xorm
*Ico's father
== Trivia ==
*Sja-anat would be able to corrupt a deadeye. This would heal them, though they would be different than before.
== Notes ==
es:Ojomuerto