The Sibling (The Stormlight Archive)

"There is ... a third sibling. They are not with us."

- The Stormfather

Summary
The Sibling is a notable Spren on Roshar, and the child of Honor and Cultivation. They are essentially the tower of Urithiru, with their essence permeating all of it, and them controlling and powering all of the Fabrials within it, and modifying it in order to be amicable towards human life despite the high altitudes. They also bonded with various Bondsmiths throughout their life, serving as the Third Bondsmith Spren.

At some point, they began to withdraw from humanity and become quiet, and the sealing away of Ba-Ado-Mishram only further hurt them, and led to their production of Towerlight to cease and for them to fully cut themselves away from humanity.

Eventually, they began to communicate with Navani Kholin over the large fabrial project she was beginning due to their hatred of most Fabrials in how they must use Spren to power themselves. This put them at odds, but after the start of the occupation of Urithiru by the Fused, and the process of them becoming corrupted, they decided to help her work to find the nodes across the tower in order to help prevent them from becoming unmade.

The Sibling ultimately formed a Nahel Bond with Navani Kholin out of necessity.

Personality
They have a hatred and distrust for humanity for how they treat Spren, due to both the massacre that occurred due to the Recreance, and due to the way they seal Spren in gemstones in order to power Fabrials. This went to such a degree to pull them out of hiding to try and push for Navani Kholin to stop her Fabrial experiments at Urithiru.

They also have trouble trusting humans, only trusting those that Urithiru due to the circumstances, wherein they were the only ones capable of stopping them from being corrupted by the Voidlight and lose their self.

They do not identify as male or female, and are confused at why other Spren identify as Human or Singer genders. They are identified throughout the book using they/them pronouns.

Powers and Stats
Name: The Sibling

Age: At least 6,000

Gender: Non-Binary

Classification: Spren, Bondsmith Spren

Powers and Abilities: Pressure Manipulation, Temperature Manipulation, Immortality, Telepathy, Transmutation and Barrier Creation, Power Nullification, Power Bestowal via Nahel Bond, Plant Manipulation, Large Size, Abstract Existence, Limited Extrasensory Perception, possibly Limted Omnipresence

Homeostasis
The Sibling is able to regulate the functions of and characteristics of the Tower of Urithiru. Able to modify the temperature and pressure in order to make it habitable at high altitudes. Along with this, it assists in the growth of crops in order to allow it to grow enough crops to sustain the large population, despite the area of land available to crops not being enough to properly sustain the projected population if grown at a normal rate.

On top of this, they are capable of communicating with those inside of it through various garnet lines which run throughout the tower and carry their consciousness.

When in danger, they are capable of transmuting air around the central chamber which contains their heart in order to form a powerful barrier. This was displayed in order to prevent further corruption by Voidlight during the Fused Occupation.

The Sibling can open, close or lock the fabrial doors in Urithiru.

Other Fabrials throughout Urithiru can form ventilation and plumbing systems. Further making it habitable and friendly to human life within the Tower.

Awareness
They have full awareness and vision of everything going on in Urithiru.

Power Nullification
They have a field which exists around them, containing the entirety of the Tower, which nullifies the powers of the Fused when they are within its boundaries.

When they were being corrupted, the focus of this nullification changed, and led to it attacking the Radiants and nullifying the powers of Surgebinding, leading to all Surgebinders, barring Kaladin, falling unconscious. This nullification effected all Surges outside of Adhesion, for it was Honor's Truest Surge and is considered by the Fused to not even be a Surge at all.

The Reason it could not effect Kaladin was that he was as close to the Fourth Ideal as he could humanly get without swearing it. Suggesting that this can not effect those of the Fourth Ideal or above.

Towerlight
The Sibling has their own form of Investiture known as Towerlight, which is born from the combination of the Investiture of Honor and Cultivation. They use this in order to power all of the Fabrials throughout Urithiru, and to increase the rate and quantity in which crops grow across Urithiru, allowing them to grow to a supernatural degree.

Nahel Bond and Surgebinding
As a Bondsmith Spren, they are capable of creating a Nahel Bond with sentient lifeforms, and in doing so turn the person they bond to into a Surgebinder of the Order of Bondsmiths, giving them access to the Surges of Tension and Adhesion.

In the past the bonded with various individuals, the last of which being Melishi. Currently they are bonded to Navani Kholin.