Pure vessel

In Hallownest there was an ancient monarch called 'Radiance'. To avoid being forgotten and regain control over their minds and wills, she created the infection (which can be noticed by a yellow glow in the eyes of the bugs).

In Telalejana there is a monarch called 'Mother Silk' who corrupted the minds of pilgrims to impose blind faith, control the kingdom through Silk and attempt to transcend her mortal state through "Ascension".

Grand Gate: The main fortified entrance to the structure.
Choral Chambers: The central sector characterized by musical architecture and choir rooms.
Cogwork Core: The center full of machinery, gears, and automatons.
High Halls: The upper galleries with fountains and waterfalls of the nobility.
Memorium (Memorium): The garden/arboretum dedicated to the preservation of species.
Whispering Vaults: The shadowy archive where history and manuscripts are kept.
White Ward / Whiteward: The medical and lower area where silk research was conducted.
The Cradle: The summit and sanctuary located above the Mechanical Core.

Bonebottom Valley: The initial settlement and surrounding area where Hornet begins her journey.
The Marrow: A network of transitional industrial tunnels with intense mining activity.
Deep Docks: Underground industrial zone filled with lava, steam, and heavy machinery.
Hunter's March: A rugged, wooded area filled with traps and combat challenges.
Greymoor: A vast, misty, open region with ruined structures.
Bellhart / Shellwood: A peaceful refuge characterized by its architecture and large bells.
The Blasted Steps: Cliffs and ruined stone structures that serve as an anteroom.
Sands of Karak: A desert area with dunes and challenges under the scorching sun.
Sinners Road: A dark and vertical route designed to test combat skills.
The Worm Dens: A network of narrow tunnels inhabited by parasites and worms.
The Citadel (with sectors such as the Choir Chambers, the Mechanical Core, the Upper Halls and the Lower Workshops): The majestic urban center and industrial complex that dominates the kingdom.
Mount Fay: A frigid, mountainous region with platforms of great vertical challenge.
Bilewater: A toxic and dangerous swamp with contaminated water.
Verdania: A lush area of ​​exuberant organic vegetation.

Kingdom's Edge: A vast, rocky area where a constant "snow" made of ash falls. It houses gigantic ruins and the Colosseum of Fools.
The Hive: A golden and warm complex built with honey and wax panels, dominated by architecture and the buzzing of bees.
The Abyss: The bottom of the world. A place of total darkness, sepulchral silence, and an infinite tide of black and shadowy mass (the Void).
White Palace: A brilliant, flawless dreamscape filled with polished white architecture, chainsaws, and thorns.
Home of the Gods: A golden celestial dimension above the clouds, filled with massive statues and combat arenas dedicated to attuning oneself to the gods.

Dirtmouth: A withered, cold, and silent town under a gray sky. It is the only safe haven on the surface, lit by a solitary lantern.
Howling Cliffs: A mountain pass battered by hurricane-force winds and desolation. It marks the outer limit of the kingdom.
Forgotten Crossroads: A network of gray stone tunnels and ruined passageways. It conveys the feeling of a forgotten structure and, later, of decay due to infection.
Green Trail: An underground jungle filled with moss, lush vegetation, sparkling acid streams, and territorial wildlife.
Fungal Wastelands: Damp caverns teeming with spores, fungi of all sizes (some bouncy) and tribal structures inhabited by mantises.
Fog Canyon: An ethereal and hot environment shrouded in mist, filled with floating jellyfish, updrafts, and acid.
Kingdom Center
City of Tears: A majestic and imposing Gothic city where it never stops raining. Its blue stone towers, crystals, and elegant architecture convey melancholy and fallen grandeur.
Crystal Summit: A luminous mine filled with pink crystals that emit light and energy, populated by ancient machinery and laser graters.
Resting Grounds: A serene and silent cemetery, filled with gravestones, statues dedicated to the Dreamers, and a spiritual atmosphere.
Deep Underground and Sewerage
Royal Canals: A labyrinth of pipes, stagnant water, and filth. It's a damp, claustrophobic place filled with grotesque creatures.
Deep Nest: A claustrophobic nightmare in the dark, filled with spider webs, narrow passageways, natural traps, and unsettling noises.
Ancient Basin: Deep, deserted, grayish caverns with abandoned real structures and a feeling of absolute solitude.
Queen's Gardens: An elegant and manicured version of Greenpath, full of stone gazebos, mechanical thorns and exotic but dangerous flora.

Great stature and armor: It is a tall creature, dressed in full armor of polished black and white plates that cover its entire body, except for its face and joints.
Head and horns: His helmet has a distinctive shape that extends upwards into two large, curved, sharp horns, similar to those of the Hollow Knight, but more refined and symmetrical.
Cloak: He wears a long, flowing cloak, pale white with dark edges, which falls from his shoulders and trails slightly behind him.
Eyes: Unlike the corrupted Hollow Knight, his eyes are dull, but they do not emit light or visible emptiness, which emphasizes his supposed "purity".
Weapon: He wields a large, finely forged, silver stinger, which he holds with both hands.

It was created by the Pale King for a single purpose: to be the perfect vessel to contain The Radiance and save Hallownest from infection. To achieve this, it had to meet a divine and cruel standard:
Without a mind to think.
Without the will to break.
Without a voice to cry out for the suffering.
In battle, Pure Vessel is the definition of cold, mechanical efficiency. It shows no rage, no fear, no hesitation, and no rejoicing. It moves with lethal grace and absolute precision, acting more like a perfectly programmed automaton or a force of nature than a living being.
The Tragic Impurity (The Hidden Flaw)
Although in the pantheon of Godhome we see him in his full physical splendor and he is called "Pure", history reveals that his purity was an illusion.
The bond with the King: The Pale King raised him, trained him, and shared moments with him. That subtle emotional bond implanted an "instilled idea" (a spark of affection, pride, or a desire to please his father) in his supposedly empty mind.
The weight of duty: This small emotional crack was what allowed the infection to eventually corrupt him in the future.
In Combat vs. The Hollow Knight
His behavior in Godhome contrasts sharply with his decadent real-world version:
Pure Vessel: Attacks with an upright, proud, and martial stance. Its focus is purely offensive and defensive; it is a warrior at the peak of its power, protecting its duty.
The Hollow Knight (Corrupted): He stabs himself in a moment of lucidity or desperation to help the Knight defeat the infection. Pure Vessel would never do that, since at that point in the timeline he has not yet been broken by the Flare nor has he lost control of his body.