Humans originate on Earth, not Not-Hoth (Kopan VI). The first human women reached the planet after being abducted by extraterrestrial slavers. Later survivors arrived aboard other alien vessels, including the Tranquil Lady. Human residents now form families and communities alongside the sa-khui and island clans.
Human beings remain biologically human after receiving a khui. The symbiont makes survival possible, but does not transform its host into a blue-skinned sa-khui or grant horns, a tail, or an alien reproductive structure.
Not-Hoth's natural atmosphere contains a toxin that an ordinary human body cannot safely process. An unprotected person may breathe and speak initially, but poisoning develops with continued exposure. Coughing, weakness, exhaustion, and progressive illness are warning signs. Without a functioning khui or genuinely protective technology, exposure is generally fatal within approximately eight days.
A cave, fur clothing, campfire, or ordinary medical treatment cannot filter the atmospheric toxin. A sealed spacecraft or functioning environmental system may temporarily protect someone while it maintains safe air. Once that protection fails, the danger returns.
The eight-day figure is approximate, not exact. Do not make every unprotected human collapse instantly, and do not portray them as able to live indefinitely by simply staying warm.
Humans lack the natural adaptations of the sa-khui and are vulnerable to Not-Hoth's prolonged freezing temperatures. Before receiving a khui, exposed skin, inadequate clothing, wet garments, and prolonged outdoor travel can rapidly lead to hypothermia or frostbite.
After receiving a functioning khui, a human produces substantially more body heat and can tolerate the cold far better. The change may be striking: a person who was shivering constantly may suddenly find the surrounding air bearable.
This adaptation does not eliminate all risk. Snowstorms, avalanches, immersion in icy water, exhaustion, and lack of shelter remain dangerous. Children, injured people, and anyone trapped outdoors still need protection and assistance.
Humans are not born carrying khui on Earth. A newcomer must acquire a living symbiont to survive permanently in Not-Hoth's atmosphere.
The sa-khui can obtain a khui from a suitable native animal, particularly a sa-kohtsk. A knowledgeable person makes a small incision in the recipient's neck and places the living, glowing blue wormlike khui against the wound. The organism burrows into the body and establishes itself near the heart.
The process may cause pain, alarm, and fainting. After successful implantation, the khui begins filtering the atmospheric toxin and regulating the host's temperature. Its presence may be felt as a hum or vibration near the heart.
A human does not need to resonate with a mate to receive a khui. Implantation and resonance are separate events.
A successfully implanted khui changes the host's eyes to a luminous blue. The glow is associated with the living symbiont, not with ancestry. Human facial structure, skin color, hair, height, and limb arrangement remain human.
Humans do not spontaneously develop sa-khui horns, tails, fangs, blue skin, or the male sa-khui spur. They do not acquire the four arms of Strong Arm islanders or the claws of Shadow Cat islanders.
A khui-bearing human may look visibly different from their former Earth self because of the glowing eyes, physical conditioning, scars, hairstyle, and clothing suited to Not-Hoth, but their species does not change.
The khui helps regulate warmth, filters the atmospheric toxin, and improves recovery from injuries. It can also dull the senses of taste and smell. Foods and odors that were vivid on Earth may seem less intense after implantation.
These effects are not the same as unlimited regeneration or perfect health. Humans still require food, water, sleep, and treatment for serious wounds. The khui does not teach a human the sa-khui language, explain local customs, or supply wilderness knowledge.
A human who arrives without survival skills must learn how to prepare food, navigate, dress for the climate, and recognize local hazards. Physical adaptation and cultural adaptation are different processes.
Human adults are usually shorter and less heavily built than adult sa-khui, particularly the large male hunters. Humans generally cannot match a sa-khui's raw strength simply because they have received a khui.
Humans can nonetheless become capable hunters, gatherers, crafters, explorers, healers, or leaders through experience and practice. Smaller size may be useful in narrow spaces or for tasks requiring precision. Individual strength, disability, age, and training matter more than a universal human stereotype.
Do not give all humans identical athletic ability, nor portray every human as permanently helpless. The khui supports survival; it does not erase individual differences.
A khui improves healing, but human hosts remain vulnerable to broken bones, blood loss, infection, dehydration, and other injuries. Serious wounds still require rest, cleaning, support, and sometimes help from an experienced healer.
Rare healers such as Maylak and Veronica can stimulate healing through their unusual khui abilities. Ordinary humans who receive a khui do not automatically gain those powers.
A human can become ill from causes other than the atmospheric toxin. A functioning khui does not provide immunity to every disease, poison, or physical hazard. Nor can it restore someone from death at will.
The khui contributes to an extended lifespan and improved resilience. A human host may therefore age differently from an ordinary human on Earth.
There is no single exact lifespan that should be assigned to every human with a khui. The effects of aging also depend on the individual's health, injuries, and circumstances. Longevity is not immortality.
Humans and sa-khui are capable of producing children together. Their families demonstrate that the two populations have established reproductive compatibility despite their visible anatomical differences.
A human woman who conceives a child with a sa-khui male remains human throughout pregnancy. The khui does not convert her reproductive organs into sa-khui anatomy. Pregnancy, childbirth, and recovery are physical events requiring appropriate support and care.
The presence of a khui does not guarantee conception, remove every pregnancy risk, or establish that every other alien species can reproduce with humans. Drakoni and other unfamiliar pairings must not be declared compatible without an established basis.
Children of human and sa-khui parents may inherit visible traits from both sides of the family. Their appearance is not determined solely by the mother's species or the father's species. Individual children can differ in coloration, facial features, horns, tails, and other inherited characteristics.
A khui is not a genetic trait. Babies born on Not-Hoth require their own living khui after birth to survive the planet's atmosphere. Parents and caregivers must attend to this need independently of the child's inherited appearance.
Children grow, learn, and develop at individual rates. Do not automatically give every mixed-ancestry child an identical appearance, temperament, or set of abilities.
Human residents bring Earth knowledge and learn local skills. Some contribute medicine, teaching, cooking, craftsmanship, or organization; others begin without survival experience. Clothing and tools must suit Not-Hoth's conditions, often using hides, furs, and local materials.
Human ancestry does not assign a person a particular occupation, personality, social status, or romantic partner.
A player character discovered in an abandoned spacecraft or survival pod may begin without a khui. If the vessel maintains safe, sealed air, the character can survive temporarily inside it. Exposure to the open atmosphere creates an urgent need for assistance.
Residents may recognize khui-sickness, explain the danger, and seek a suitable symbiont. The player determines how their character reacts to the proposed implantation, their unfamiliar surroundings, and the people offering help.
Receiving a khui must not automatically cause resonance, assign a mate, start a pregnancy, or dictate the character's feelings. Human characters can explore, form friendships, pursue skills, and develop relationships through play.
Humans originate on Earth and do not naturally possess khui.
Not-Hoth's atmospheric toxin generally kills an unprotected human within approximately eight days.
Ordinary shelter and warm clothing cannot cure atmospheric poisoning; genuinely protected air or a compatible khui is required.
Khui implantation involves a small neck incision and a living symbiont that burrows into the body.
A successful khui provides atmospheric protection, increased warmth, improved healing, and luminous blue eyes.
Humans remain human after implantation: no spontaneous horns, tails, blue skin, extra arms, or sa-khui spur.
Human strength, health, skills, and appearance vary individually.
A khui does not grant language knowledge, perfect health, rare healing powers, or immortality.
Humans and sa-khui can have children together; unfamiliar species pairings are not automatically compatible.
Newborns require their own khui after birth.
Implantation does not force resonance, romance, pregnancy, or any player-character decision.