|Abilities||Nahel bond, Bondsmith magic|
|Bonded With||Navani, Melishi (formerly)|
|Featured In||The Stormlight Archive|
”There is ... a third sibling. They are not with us.—The Stormfather
The Sibling is a notable spren on Roshar. They are of the same power level as the Stormfather and the Nightwatcher, and is the third spren historically associated with the Order of Bondsmiths. The Sibling manifests physically as many fabrials within the tower and have control over them, with the crystal pillar being the heart. They are currently bonded to Navani Kholin.
Attributes and Abilities
The Sibling is known to have been alive for at least four and a half millennia and is functionally immortal. The Sibling does not view themselves as having a gender. Despite living thousands of years, they remain somewhat naïve. Oathgate spren follows the orders of Siblings and refers to the Sibling as parents.
Whilst the Nightwatcher and the Stormfather are known to be connected to Cultivation and Honor respectively, the Sibling is the child of both Honor and Cultivation. The Stormfather considers all three of them to be "siblings", and the fact that they are the only three spren that can bond with Bondsmiths indicates that they share some characteristics.
The Sibling is essentially the Tower of Urithiru and controls the many fabrials within. When humans rediscovered Urithiru, most of the fabrials are dysfunctional. Functioning fabrial systems include those for increased pressure, temperature, and general conditions encouraging plant growth. Navani also theorizes that the air circulating through various shafts is powered by some sort of fabrial. In addition, the fabrial elevators connecting Urithiru's floors begin running when gemstones are inserted. Also, basic suppression of Fused powers is active. The red garnet vein within the wall strata serves as means of communication. It can lit up with light and upon being touched, the Sibling will be able to mentally speak with the person, although this can be eavesdropped through unknown method. They can also talk to people in weak mental state. In this state, the Sibling can only see a small area around people who are Connected to them, mainly the Radiants. The Sibling can open, close or lock the fabrial doors in Urithiru.
After restored to full powers, the Sibling can see everywhere within the tower. The Sibling can also fully power and control every fabrial that makes up the tower. The temperature becomes warmer since heating fabrials become more potent, for example. It was once possible to only allow certain people to open a door in the past, and with the tower fully restored, this function is likely available again.
The Sibling is capable of producing their own investiture known as Towerlight, a mixture of Lifelight and Stormlight, which they use to power the fabrials in Urithiru. They need to be able to harmonize the songs of Honor and Cultivation in order to produce Towerlight.
”My research into the cognitive reflections of the spren at the tower has been deeply illustrative. Some thought that the Sibling had withdrawn from men by intent—but I find counter to that theory.
Heraldic Epochs and Era of Solitude
The Sibling was capable of forming a Nahel bond. There could never be more than three Bondsmiths, there were long periods where only one existed, which might have referred to the Sibling's Bondsmith, as they were vital for Urithiru to properly function.
The Sibling was somehow the key to certain magical aspects of the tower city of Urithiru that served as the base of the Knights Radiant. Notably, the Sibling's presence was linked to the climate of the city, allowing the temperature to stay unnaturally warm given Urithiru's elevation. This allowed the Radiants to cultivate crops in the city to sustain the large population there. At some point, the Sibling began to withdraw from the tower. The Sibling's withdrawal caused some—but not all— of the city's magical systems to fail; it soon became uninhabitable, and the Radiants were forced to abandon the city. It is not clear why the Sibling disengaged with mankind; an Elsecaller who left notes in the gem archive argued that the spren's disappearance was neither intentional nor a result of internal strife among the Knights Radiant. The Sibling was wounded by the imprisonment of Ba-Ado-Mishram; this wound resulted in the Sibling losing the rhythm of Towerlight, which in turn stopped Urithiru functioning.
After the Sibling's departure, they were not hiding but rather "slumbering" in the millennia following the abandonment of Urithiru and the Recreance. The Stormfather has generally been reticent to discuss the Sibling with Dalinar because they were somehow harmed by mankind in the past.
The Sibling first made contact with Navani Kholin, through a purposefully placed spanreed ruby.
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