The Halved

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"The attention of the Halved falls briefly on your vessel. Your crew wail as its eye fills your windows!

"The Halved! The sun turned to night!"

The Halved is a Judgement that presides over the region of Eleutheria, in the High Wilderness.

WE ARE BEHELD

The Halved governs distance and measures, and it has an array of servants, just like the other Judgements. In fact, the Halved murdered its own space-crab messenger, the House of Rods and Chains, for defying its command. The Halved is directly responsible for Eleutheria's lawlessness, as it radiates darkness instead of light. The Halved is also the leader of the many organizations in its realm, such as Piranesi and Pan, and it is the arch-enemy of The Sapphir'd King. The Halved claims to have changed, but as Mr Barleycorn points out, it may not have changed as much as it thinks. 

The Sun Turned Black

"You see a blazing, golden sun, so close it fills the sky. It shudders. It dims. You watch as it draws its fires into itself, becoming sullen, crimson coals. Its surface cools, scabbing over with a black crust. Shadows flood this region of the sky."

The Halved is a former binary star; its other half, named the King who Speaks was betrayed and murdered during a revolution. This was incited by the current resident of the Well of Wonders, a Fingerking storyteller who tried to persuade the Binary to abandon their light. The storyteller was turned into a living story as a punishment for the murder. The death of the King who Speaks also caused the remaining half, formerly called the King who Wars, to go on a rampage and destroy most of Eleutheria's majestic structures. 

Against all odds, another storyteller somehow able to persuade the King who Wars to change its viewpoint. The King abandoned its law, and started to actively radiate darkness instead of light. This is what causes Eleutheria's bizarre and Revolutionary-friendly nature. Either as a form of gratitude or punishment, the now Halved sun turned the storyteller into the plant now known as the Heart-Catcher. Speaking the Halved's former name is a one way ticket to Piranesi. Storytelling in its presence will also land one there. 

The Eye in the Zee. Reconstructed texture from Sunless Sea.

It is heavily implied that the colossal Eye that lies beneath the Unterzee is the Halved; this curious entity sprouts extra eyes on the bodies of zee-captains as a form of "message" to the Neath. Diving into the Eye will warp a zailor to the House of Rods and Chains, and the House even has a door back.

The Halved has strong ties to the Liberation of Night, possibly to seek revenge upon other Judgements. One Judgement, the Regent of the Reach, has already fallen victim to its machinations.