Ren

Ren is an energy that exists through and alongside reality. It is will, ideals, beliefs, and intent, already set in motion. It aligns with concepts, phenomena, and matter of all kinds, and it is structured into patterns at a particulate level. Each pattern is a polarity. Ren is invisible and immaterial. It cannot be perceived with ordinary senses.

Ren is not magic in any common understanding of the word. There are no spells, no arcane disciplines. Ren is a real energy: it can be accumulated, stored, and depleted. But what determines how it expresses, and how much a person can hold and wield, is not training or talent in any ordinary sense. Ren is built from the experience, motive, and identity of the person who wields it. Those who wield Ren wield themselves.

The Four Principles

Beneath the Laws sit four Principles, the most basic truths about Ren. Each is also a polarity, listed under Principles on the Polarities page.

Principle	What it holds	Polarity
Ren exists.	Existence is.	Truth
Ren can change.	Being does not remain static.	Time/Change
Ren can be differentiated.	There are different things, categories, and properties.	Differentiation
Ren can influence reality.	Will and reality act on each other.	Influence

The Eight Laws

Ren does not behave arbitrarily. Scholars of the Gate have long observed that it follows eight laws. Every one of them is built on the four Principles, and each corresponds to the innate attunement of one of the lineages.

Law	What it holds	Lineage
Transformation	Ren alters its nature to persist. Identity is mutable, essence is not.	Anamor
Coalescence	Ren cannot be destroyed or created, but can be removed or concentrated.	Daruner
Flux	Ren circulates and exchanges between all things. What is still is instead moving through time.	Elkyr
Resonation	Ren can resonate with concepts to a greater effect than normal.	Haqol
Elasticity	Ren bends but does not break. What is displaced seeks restoration of form.	Janim
Unification	Ren yields to a single purpose. What is set aside strengthens what remains.	Nyl
Recurrence	Ren recurs throughout the world and establishes cycles.	Okoi
Emergence	Ren manifests new structure and meaning when conditions allow. What was unseen becomes real; what was potential becomes form.	Theridim

The eighth law, Emergence, only is accessible when one has all of the other lineages - this is what makes you theridim.

Rennim and Renak

No one is born a Rennim. The ability to wield Ren is awakened, not inherited. Any person can potentially become Rennim. Most never do.

Rennim make up roughly one in a thousand of the general population. The rarity is not incidental: it shapes every social structure in every nation. A Rennim is not simply a person who can fight differently. They are categorically apart from ordinary life, in the way that ancient martial traditions understood cultivators in Wuxia and Xianxia to be apart. Nations, guilds, religious sects, noble houses, and criminal organizations all orient themselves in relation to Rennim, whether through recruitment, control, fear, or worship.

Those who cannot wield Ren are called Renak. Blood and destiny do not set the line between Renak and Rennim. Anyone might cross it, given the right conditions or the wrong ones.

Awakening

The first moment of Ren contact is almost never gentle. Awakening is typically triggered by an extremely potent emotion or an intense, often desperate experience: grief, terror, fury, starvation, the death of someone close. The body begins to sense something it never could before. Most people who awaken have no framework for what is happening to them. The sensation is alien. Without guidance, it can be as dangerous as it is transformative.

Wielding Ren is talked about in several ways. Whether discussed as belief, ideals, will, or intent, it very much mirrors its user. It’s not inborn, and is difficult to learn and master. Whether from means, opportunity, time, or experience, Rennim are no strangers to challenge just in the process of becoming someone who can use Ren.

How People Learn

There is no standard path. The Gate of Zerathrain in Dosharen offers the most formalized training on the continent, but most Rennim never set foot there. They learn through faction or sect training shaped to serve an organization’s needs, through military standardization, through direct apprenticeship, or through religious and academic study. Some find forbidden texts. Some learn alone, slowly, out of survival necessity, feeling for what does not kill them and doing it again.

Self-taught practitioners tend to be experimental and scarred in ways others are not. Those trained by institutions tend to be efficient and limited in the same ways their institutions are. Neither path produces better Rennim. They produce different ones.

The process and major steps of advancement

Ren flows throughout the whole body, much as cultivation does in Wuxia and Xianxia, along a different set of pathways. Every Ren user has to find a way to circulate Ren through their body so that it reaches and infuses every part of it. Learning Ren starts with sensing and moving it. Next is establishing a continuous circulation throughout your body. After that comes solidifying a core. The next realm occurs when you create a set of cores to mirror the pattern of your ren signature. The last phase that mortals can reach for is to create sets of cores to then mirror the pattern of your Ren.

The realms are: Void (0) -> Spark (1) -> Flame (2) -> Star (3) -> Constellation (4) -> Galaxy (5).

Each of these comes with an increase in the density of your Ren, or the general strength of your will. Whether it’s a will to understand, to convince, or to harm, your intent works and influences reality passively more and more as your realm increases. Opposing a higher realm opponent is a death sentence in most cases, as their vast wills make it so things naturally hurt them less, they regenerate faster, and reality subtly acts to make their wills come true. Beware.

As you learn to use Ren, guidance and care are paramount to progression. Improper movement or technique can cause you to severely harm yourself, crippling damage, or even deformities. Most don’t learn Ren on their own, and those who do go slow and steady.

Realms

As a Rennim cultivates, they progress through stages of depth called Realms. Each represents a structural change in how Ren is held and circulated in the body, not simply a quantity of power accumulated.

Realm	Name	Description
0	Void	Pre-awakening.
1	Spark	Ren can be sensed and you learn to circulate through the body. The beginning of real practice.
2	Flame	A stable, autonomous circulation of Ren is established. Competent. Capable of independent missions.
3	Star	A core forms: a stable, condensed center of Ren. Competent. The highest tier most practitioners ever reach.
4	Constellation	Multiple cores in an established pattern. Formidable by any ordinary standard.
5	Galaxy	The mortal limit. Full sets of core patterns. A Galaxy-realm Rennim is a force that reshapes whatever ground they stand on.
6	Singularity	Beyond the mortal limit. Theorized. Perhaps achieved, only achievable by spirits or Yndryr.

Advancement cannot happen through discipline alone. To break into a higher Realm, a practitioner needs exposure to Ren of greater density than their body currently holds: beast cores, Ren crystals, refined elixirs, or immersion in high-density Ren environments. This creates one of the defining tensions of life in Ithasen. The gap between any two Realms is not a matter of degree. A practitioner who faces someone a full Realm above them is not at a disadvantage. They are in danger.

Experience, Motive, and Identity

Ren does not respond to technique alone. It responds to what the person using it has done, what they were after, and who they have become.

Experience. What a person did in a moment is recorded as an experience. Polarities and keywords come from experiences, and the concepts, ideas, places, and things a person has spent the most time with supply the material. Years at a forge can leave a smith with Metal, Heat and/or even more niche polarities like assembly.

Motive. A person’s will is aimed at something, such as a thing they want or a thing they will not allow. That aim is their motive, and it is the reason behind the action an experience records.

Identity. Identity is the sum of what a person has done and what they were after when they did it. Their Ren is built from the same material.

Polarities and signature. A polarity is a pattern of Ren. It forms when many minds hold the same concept, Rennim or ordinary Renak, or when Ylelaim creates it directly. Technology is the most recent polarity to come into existence. Each person has a will of their own, and the polarities they hold connect that will to the world. A person needs a full set of polarities to awaken, and the emotion that triggered the awakening is one of them. The combined arrangement of one person’s polarities is their signature, and no two signatures are exactly alike. Trained Awareness can read these signatures.

Two Rennim who hold Heat do not wield the same thing. A Rennim who learned Heat by burning a village has a different signature than one who kept a hearth alive through a bad winter, even though the polarity is the same. They leverage flame with different intents, one is benevolent, one is malevolent.

Polarities can change after awakening. A Rennim whose experiences take them in a new direction can gain a polarity, but only by giving up one they hold.

This is what scholars call Ren’s mirror quality: it reflects what a person has done and what they were after. Ren cannot be faked, because nothing in a signature exists that the person did not live.

Why Polarities Change Spirits

Spirits are not separate beings who happen to share a concept with a polarity. A spirit is a coalescence of a concept, a polarity of Ren that has accumulated enough will and identity to become conscious. The spirit of Heat is heat itself, at the level of fundamental Ren structure. Spirits are a piece of the Ren that underlies reality.

When a Rennim wields a polarity, they engage with that concept through the specific lens of their motive and identity. They are not borrowing a concept. They are asserting a particular version of it: what the concept means to them, expressed at the level of Ren. When that engagement reaches a spirit, it does not simply interact with the spirit from the outside. The Rennim’s version of the concept presses against the spirit’s own desires or other influences on the spirit. What the practitioner believes Heat is begins to become part of what Heat is and how that spirit is working through the remnant continent now.

This is why the relationship between a Rennim and a spirit is transformative rather than contractual. There is no agreement that leaves both parties intact. Something shifts in the spirit based on what the Rennim has made of the concept it embodies.

Categories of Polarity

Polarities span a wide range of concepts. They are organized into the following categories:

Category	Examples
Principles	Truth, Time/Change, Differentiation, Influence
Physics	Space, Kinetics, Gravity, Heat, Light, Sound
Operations	Addition, Division, Piercing, Creation, Destruction, Ruination
Lineages	Transformation, Coalescence, Flux, Resonation, Elasticity, Unification, Recurrence, Emergence
States	Equilibrium, Corruption, Redemption, Death, Pain, Order, Chaos, Conflict/War
Emotions	Anger, Sorrow, Joy, Fear, Love, Shame
Materials	Earth, Metal, Water, Wood, Blood, Wind
Interstitials	Life, Sapience, Soul, Bonds, Dreams, Concealment
Instruments	Blade/Sword, Bow/Arrow, Hands/Gauntlets, Words/Speech/Tongue/Names, Glyphs/Script
Doctrines	Deceit, Pride, Faith, Justice, Vigilance
Loci	Sea, Sky, Forest, Desert, Mountain
Cives	Design, Art, Alchemy, Technology, Commerce, Craft
Seasons	Spring, Summer, Fall, Winter
Inversions	Shadow, Cold, Void

There are many named polarities, and new polarities are being born, the most recent in the remnant continent being technology.

Most Rennim wield a handful of polarities across their life. Those who wield many widely are unusual; those who take a single polarity to an extreme depth are not.

Texture

Ren circulation is not uniform. It has a texture: a quality of stability that varies from person to person, and represents how much a Rennim’s will influences, and is influenced by, the world.

Texture	Behavior
Tranquil	Smooth and stable. Rarely produces unexpected results.
Volatile	Barely stable. Output is less predictable.
Rampant	Unstable. Produces outsized effects in both directions.

Texture is not a reflection of character. A Tranquil circulation does not indicate virtue. A Rampant circulation does not indicate corruption.

Most of the world disagrees. In nearly every nation, Tranquil Ren is associated with discipline, integrity, and trustworthiness. Rampant Ren is associated with danger, instability, and poor moral character. These associations are embedded in law, religion, and social expectation. A Rennim with Rampant texture will find doors closed that would be open to them otherwise, regardless of what they have actually done.

The people of Ithasen built their assumptions about Ren texture from observation of behavior, not understanding of cause. The association is not meaningless: extreme emotional instability and extreme Ren instability do co-occur in some cases. But correlation has been mistaken for identity, and the mistake has had real consequences for how Rennim are treated and how they understand themselves.

Awareness

Ren cannot be seen with ordinary eyes. Rennim develop an additional sense as the entry point for them to begin weilding Ren: Awareness. It allows them to perceive Ren density in the environment, and at closer range or greater focus, the specific polarities or Ren texture another practitioner carries.

Awareness has social implications beyond combat. It exists on a spectrum:

Suppressed: Ren held inward. The default state in most social contexts. Extended detection by another practitioner reveals realm. This is the polite posture, the equivalent of keeping your hands visible.

Cloaked: Appearing to have no Ren at all, like pretending you carry no weapons. Useful for concealment. Understood, in social contexts, as deliberate hiding.

Extended: Like feeling your own polarities in the world. A practitioner using Extended Awareness senses where their own polarities are present in the surroundings. Another person lights up only if they share one of those polarities, and Extended cannot tell you what polarities they carry. Realm still registers. Other extended practitioners will notice. Extended reveals little about anyone else outside of Realm, so it passes as ordinary attention to one’s surroundings generally, but can feel uncomfortable if occurring over a long time by strangers. In areas where there are a lot of Rennim, keeping your awareness in this state in those environments is generally frowned upon.

Projected: Attention concentrated on an area at a distance, like searching for something. It reveals the realm of those within it and their most prominent polarity. Other practitioners read the search at once. The intrusion is mild, but those inside the area feel it, which is uncomfortable and makes it a little rude.

Focused: Full attention concentrated on a specific person, like a detailed examination. Reveals their realm, texture, and polarities. This is considered deeply intrusive. Focusing on someone without combat context is widely understood as a threat or a declaration of hostile intent. Doing it without warning is likely to provoke a confrontation.

Awareness etiquette varies by nation and faction, but the underlying logic is consistent: Ren perception gives access to information about another person that they have not chosen to share. The conventions around it are, at root, about consent and respect.

Spirits and Ren

Spirits are coalescences of ideas and concepts, born from divine or collective will. They are, in the terms scholars use, polarities of Ren with amalgamated consciousness: a concept or set of closely related concepts that has become aware of itself.

When Rennim are described as contractors of spirits, what this means is not a formal agreement. The relationship transforms the spirit’s nature. The user does not employ the spirit. They change what it is.

Spirit Descent is the act of allowing a spirit to inhabit a mortal body and gain physical form. It requires a Rennim to perform a sacrifice using Daruner blood. Several spirits, named in religious traditions as Thasatur, Ingridrid, and Parthil, desire to descend and rule. The cults that serve them work to facilitate this. The Yrialin’s mission is explicitly concerned with preventing it.

For full cosmological context, see Cosmology.

Ren Materials

Ren concentrations in the natural world produce materials with unique properties:

Material	Source	Common Use
Ren Crystals (Ryc)	High-density Ren environments	Technology, currency, constructs
Turim	Ren-infused metals	Special construction
Kerim	Ren-infused stone	Fortification, infrastructure
Ren Ink	Ren-infused ink	Inscription, written constructs
Ren Beast Cores	Harvested from Ren creatures	Realm advancement, crafting
Ren Plants	Ren-rich environments	Elixirs, advancement

For economy and trade context, see Daily Life & Economy.