The Equestrian Underdark

Overview

Beneath modern Equestria lies a fragmented archaeological record. Isolated pockets of ruins, commonly called dungeons, mark the remains of countless predecessor civilizations that rose and fell before the unification under Princesses Celestia and Luna. These sites range from small outposts to vast underground complexes, each preserving a moment from a culture that vanished into history.

Historical Context

The Predecessor Kingdoms Era (Approx. 2000–800 years before Equestria’s founding)

Before the unification of the three pony tribes roughly 1100 years ago, the land was politically fragmented. Dozens, perhaps hundreds, of smaller kingdoms, city-states, tribal territories, and settlements rose and fell across what would become Equestrian territory. These were not primitive societies. Many achieved remarkable magical, architectural, and cultural sophistication.

Some endured for centuries. Others burned bright and brief. All are now known only through their ruins.

Why They Fell

Tribal conflict. Earth ponies, pegasi, and unicorns frequently warred before harmony Magical disasters. Failed experiments, unstable ley lines, cursed artifacts Environmental catastrophe. Droughts, floods, volcanic activity, Everfree-style wild magic Plague and disease. Epidemics erased entire populations Economic collapse. Trade disruption, resource depletion, famine Abandonment. Gradual migration toward safer or more prosperous regions The Windigo Crisis. The great freeze remembered in Hearth’s Warming legends

The Question of Connection

Most ruins are isolated by geography, time, and culture. A unicorn magical academy shares little with an earth pony agricultural settlement hundreds of miles away and centuries earlier.

However, persistent evidence suggests a deeper layer. References to Primary Nexus systems and subsidiary sites appear in maintenance records. Some enchantments draw power from no visible source. Certain locations share architectural similarities despite having no obvious cultural link. If a connected civilization existed, it was either erased beyond recognition or lies deeper than anypony has yet delved.

Types of Ruins

Urban Ruins

Abandoned cities and settlements, buried, collapsed, or overgrown. Some were built above ground and later entombed by time. Others were carved into cliffs or vast caverns.

Common features. Residential districts, markets, temples or magical focal points, administration buildings, fortifications Dangers. Structural instability, collapsed passages, hidden voids, disorienting layouts Treasures. Household goods, currency hoards, art, historical records

Magical Infrastructure

The utilitarian backbone of ancient civilizations. Aqueducts, sewers, power distribution networks, transport tunnels, and storage vaults. Often the most intact sites, built to endure.

Common features. Precise geometry, runic notation, modular construction, maintenance access Dangers. Active systems that reject modern users, automated defenses, flooding, magical runoff Treasures. Functional enchantments, technical manuals, power crystals, rare materials

Religious and Ceremonial Sites

Temples, shrines, burial complexes, and ritual chambers built to house power and inspire awe.

Common features. Grand halls, astronomical alignments, inner sanctums, offering chambers Dangers. Curse magic, bound guardians, punitive traps, unstable blessings Treasures. Religious artifacts, precious materials, burial goods, sacred texts

Military Installations

Fortresses, armories, and strategic outposts built for defense and power projection. Many remain deadly because their defenses still function.

Common features. Fortified corridors, weapon stores, command centers, prisons Dangers. Military-grade traps, unstable weaponry, bound constructs, amplified combat magic Treasures. Weapons, armor, military records, enchanted equipment

Research Facilities

Magical universities, laboratories, observatories, and testing grounds where knowledge was pushed, sometimes too far.

Common features. Libraries, labs, containment chambers, extensive documentation Dangers. Active failed experiments, warped reality, escaped specimens Treasures. Spell research, alchemical formulas, experimental artifacts, rare reagents

Industrial Sites

Mines, forges, factories, and workshops. The economic engines of dead civilizations.

Common features. Heavy machinery, processing areas, storage, transport infrastructure Dangers. Structural collapse, toxic residue, malfunctioning equipment, flooding Treasures. Raw materials, finished goods, tools, industrial techniques

Architectural Styles and Materials

Unicorn Kingdoms

Elegant, vertical construction emphasizing light and precision. Crystalline materials and layered enchantments are common.

Signature features. Soaring arches, floating platforms, magical lighting, libraries Magic style. Complex, interdependent systems using power crystals Decay pattern. Uneven magical failure resulting in sudden collapses and catastrophic loss of preservation

Earth Pony Settlements

Horizontal, organic construction integrated into the landscape using stone and living architecture.

Signature features. Communal spaces, food storage, terraced chambers, water systems Magic style. Subtle reinforcement, fertility, and preservation enchantments Decay pattern. Organic materials lost while stone structures remain stable

Pegasus Outposts (Rare Underground)

Temporary ground installations never meant to last.

Signature features. Large open spaces, minimal decoration, weather equipment Magic style. Weather and wind manipulation, largely dissipated Decay pattern. Heavily ruined and valuable mainly for cultural insight

Mixed or Unified Settlements

Post-tribal sites experimenting with combined traditions before formal unification.

Signature features. Distinct districts linked by shared infrastructure Magic style. Collaborative but sometimes incompatible systems Decay pattern. Highly variable by district

The Deep Builders (Unknown Origin)

Rare, deep sites that match no known pony tradition.

Signature features. Impossible geometry, unknown materials, unreadable writing Magic style. Entirely foreign and possibly networked Decay pattern. Minimal. Systems still function Scholarly debate. Advanced ponies, another species, or something predating recorded history

The Inhabitants

Constructed Guardians

Magical constructs and bound spirits still performing ancient duties.

Behavior. Follow obsolete programming without awareness of their creators’ demise

Examples include golems, animated armor, active wards, and bound spirits.

Natural Colonizers

Animals and magical creatures that claimed ruins after abandonment.

Behavior. Territorial but not malicious

Examples include cave fauna, fungal ecosystems, scavenger packs, and apex predators.

Magical Corruption

Creatures twisted by prolonged exposure to unstable magic.

Behavior. Unpredictable and often suffering

Examples include crystallized beasts, magical gigantism, elemental fusion, and temporal distortion.

Deliberate Threats

Traps, curses, and guardians designed to keep intruders out.

Behavior. Functional and merciless

Examples include mechanical traps, magical traps, bound guardians, cursed objects, and riddle locks.

Other Delvers

Modern explorers with competing goals.

Behavior. Cooperative, hostile, or desperate

Examples include rival hunters, academics, smugglers, the lost, and cult members.

The Remnants

Survivors or descendants who never left.

Behavior. Isolated, suspicious, and tragic

Examples include isolated families, memory keepers, cargo-cult descendants, and the changed.

Environmental Hazards

Structural

Collapses, unstable floors, blocked passages, vertical drops

Atmospheric

Toxic air, temperature extremes, flooding, absolute darkness

Magical

Wild magic zones, magical radiation, ley instability, curse residue

Biological

Disease, poisonous flora, parasites, contaminated water

The Lanternbound Three

Lasting Glow, Risky Business, and Vesper Gale are a small band of adventurers who call themselves The Lanternbound Three. It was Risky's idea.

Lasting Glow

Basic Information

Species: Unicorn Gender: Mare Age: Late twenties Home: Originally Baltimare, currently rents a small apartment in Canterlot Occupation: Municipal Enchantment Maintenance Contractor Secondary Occupation: Dungeon delver, usually described as architectural magical survey work

Physical Description

Lasting Glow has a warm cream-colored coat and a soft golden-yellow mane usually tied into a messy bun that never quite stays contained. Loose strands frame her face no matter how carefully she fixes it. Her eyes are amber-brown and often slightly unfocused when she is thinking through a problem. Her cutie mark shows a steady lantern flame enclosed in a perfect circle, a symbol of sustained and reliable enchantment.

She is average in height and build. Her horn shows subtle smoothness near the base from years of channeling slow, steady magic rather than sharp bursts, a detail most ponies would miss. Chalk dust and ink stains are almost always visible somewhere on her coat or hooves, and her saddlebags carry a familiar assortment of tools including chalk, notebooks, measuring crystals, brushes, chisels, and sample vials.

She moves with an easy, distracted clumsiness that disappears the moment she begins working. When focused, her posture settles, her movements become precise, and her expression sharpens into quiet concentration. At rest, she looks friendly and slightly bemused, as though the world is a little confusing but fundamentally kind.

Background and Family

Lasting Glow grew up in Baltimare, a working-class port city on Equestria’s eastern coast. Her father, Steady Hoof, works as a dockyard supervisor. Her mother, Bright Harbor, runs a small chandlery supplying ropes, lanterns, and simple enchanted navigation tools. She has two older brothers who followed their father into dock work and a younger sister studying maritime law.

She is the only unicorn in the family, an uncommon but not unheard-of occurrence. Her family was proud of her talent but unsure how to support it. They saved to send her to a practical technical school in Baltimare rather than a prestigious academy. There, she trained in industrial and municipal enchantment work and graduated with honors in Infrastructure Enchantment.

Her family still lives in Baltimare. She visits when she can and brings small enchanted gifts that are useful rather than impressive. They worry about her life in Canterlot, though they picture her work as safe and supervised. Her father hopes she will eventually settle down and open her own shop. Her mother worries she is too isolated. Her sister finds her work exciting and does not understand why she does not publish or seek recognition. The affection is genuine, even when they do not quite understand her choices.

Personality

Lasting Glow is warm and open. She assumes the best of others and treats ponies of all social standing with the same casual respect. She is not naive so much as optimistic about people’s intentions.

She is easily distracted and prone to stopping mid-conversation when something catches her attention. This makes her unreliable with schedules but exceptionally good at noticing details others miss. She takes things literally, struggles with sarcasm, and responds to teasing with sincere confusion rather than offense.

She speaks plainly, with a working-class Baltimare cadence rather than academic formality. Her explanations are practical, informal, and full of everyday metaphors, even when describing complex magical systems.

She avoids conflict whenever possible. She will agree outwardly to keep the peace, then quietly adjust plans later. Apologies come easily, often unnecessarily. Despite this, she is not indecisive when working. Once she has identified a problem, she commits to solving it with steady confidence.

She frequently loses track of time while working. Hours can pass unnoticed, along with meals and sleep. When focused, her precision is absolute. Measurements are exact, documentation meticulous, and enchantments stable. The contrast between her scattered demeanor and her professional competence is striking.

Skills and Abilities

Lasting Glow specializes in ritual and infrastructure magic. She works slowly and deliberately, building enchantments meant to last for generations. She cannot perform advanced combat magic, but her spells are durable and reliable.

She excels at analyzing existing enchantments, breaking them down into component structures, and identifying weaknesses or modifications. She creates enchanted tools and objects that are unremarkable in appearance but extremely dependable.

She is fluent in multiple ancient runic systems, which she treats as technical notation rather than mystical language. Her experience maintaining public infrastructure allows her to assess structural integrity, load-bearing elements, and environmental stress points at a glance.

Her understanding of ancient magic comes from repair rather than theory. She knows how old systems function because she has fixed them, even when she lacks historical context. In the field, she relies on a wide range of practical utility spells for light, preservation, cleaning, minor repair, water purification, and temperature control.

The Discovery: The Maintenance Logs

Eighteen months ago, Lasting Glow was contracted by Canterlot’s municipal services to repair failing water-regulation enchantments in the old aqueduct tunnels beneath the city. The job was expected to take three days.

While tracing the enchantment network, she noticed that several systems were still drawing power from an unidentified source. Following the flow led her to a sealed chamber absent from modern maps. Inside, she found maintenance logs written in terse, practical shorthand by ancient infrastructure workers.

The entries referenced routine pressure checks, conduit maintenance, and something called a Primary Nexus. The logs described a centralized power source supplying energy to multiple subsidiary sites across a region far larger than Canterlot.

Modern Equestria has no equivalent system. All enchantments require individual casting and renewal. These records suggest that ancient ponies once built a distributed magical network capable of sustaining thousands of enchantments at a distance, quietly and indefinitely.

Risky Business

Basic Information

Species: Earth Pony Gender: Mare Age: Mid-twenties Home: Originally Ponyville, currently wherever the adventure is Occupation: Treasure Hunter and Dungeon Delver Cover Story: Traveling writer and historical documentarian

Physical Description

Risky Business has a terracotta-orange coat and a crimson mane pulled into a high, practical ponytail. Her eyes are bright green and rarely still, always scanning her surroundings. Her cutie mark depicts a stylized tree with a small figure at the very top, earned the day she climbed higher than anypony thought safe to rescue Mrs. Hoofsworth’s cat.

She is lean, compact, and all coiled energy. Years of climbing, crawling through ruins, and hauling treasure have left her exceptionally strong for an earth pony. She moves with restless confidence and has difficulty standing still, often pacing, bouncing on her hooves, or inspecting whatever is nearby.

Her gear balances practicality with flair. She carries a battered leather saddlebag covered in patches and small trophies from past delves, along with extensive climbing equipment and chalk for grip. A bright red bandana hangs at her neck, serving as dust mask, bandage, or signal flag as needed. She is almost always smiling. A small scar above her left eye comes from an early accident, though the story of how it happened changes every time she tells it.

Background and Family

Risky grew up an only child in Ponyville during a decade of repeated world-ending crises. She watched heroes save Equestria from the sidelines and felt like a spectator in her own hometown.

Her parents run a successful flower farm on Ponyville’s outskirts. It is peaceful, profitable, and unbearably dull to her. While they cultivated stability, Risky devoured adventure novels, especially the Daring Do series, and climbed everything she could reach. Trees, rooftops, towers, and the rocky edges of the Everfree Forest all became proving grounds.

Her cutie mark appeared when she climbed the tallest oak in town to rescue a stranded cat after every authority declared it too dangerous. The mark did not celebrate the rescue so much as the climb itself. It told her exactly where she belonged.

She spent her teenage years exploring Ponyville’s caves, abandoned quarries, and nearby ruins. At eighteen, after a particularly uninspiring town festival, she left. She told her parents she was traveling as a writer and historical documentarian. They were proud. She still sends letters home filled with carefully edited accounts of ruins and research, occasionally padded with terrible poetry or sketches to sell the story.

They do not know she is a treasure hunter. They believe she stays in guest houses and libraries, not tents and questionable inns. They ask when she will publish her book. She keeps meaning to write one. She has not.

Personality

Risky is enthusiastic to the point of recklessness. She treats danger as an experience rather than a warning and approaches new ruins with open delight. She recognizes risk accurately but rarely lets that recognition stop her.

She is aggressively cheerful and uncomfortable with silence, filling it with chatter, jokes, or motion. She is competitive without malice and wants to be first simply because it is fun to be first.

She is pragmatic about money. Risky is in this to get paid, and she is honest about that. She tracks black market prices, negotiates confidently, and splits shares fairly without pretending profit is secondary.

She is impatient with planning and prefers action to deliberation. Luck and improvisation have carried her this far, and she trusts them more than caution.

She is lonely and refuses to acknowledge it. Independence is her brand, but having a team matters to her more than she will admit. She lies easily about her cover story and almost nowhere else. Ask her opinion and she will give it. Ask about her feelings and she will dodge with humor.

Skills and Abilities

Risky is an expert climber, able to scale nearly any surface through instinctive understanding of balance, weight, and momentum. Her cutie mark gives her a refined sense for danger, allowing her to assess risk quickly even if she chooses to ignore it. She is skilled with rope work, rescue techniques, and improvised rigging, and is comfortable surviving outdoors with minimal supplies.

She is physically strong, enduring, and athletic, with excellent balance and reflexes. She has learned to appraise treasure through experience, mistakes, and reading, and maintains a network of black market contacts for artifacts that cannot be sold legally.

Current Situation

Risky has been treasure hunting for six years. Her early attempts were disastrous and nearly fatal, but she learned quickly. She now has a reputation as a skilled climber and delver, though some expedition leaders consider her more liability than asset.

Her finances are unstable. Successful finds buy comfort and freedom. Lean months mean rough living and foraged meals. When she can, she sends money home under the pretense of publisher advances.

Goals and Motivations

Risky wants treasure, adventure, and proof that she chose the right life. Beneath that, she wants to be the protagonist rather than the bystander. What she truly needs is belonging, a group that chooses her rather than hires her.

Her deepest fear is returning to Ponyville unchanged, her adventures reduced to stories about a phase she went through. She would rather face death underground than that future.

Vesper Gale

Basic Information

Species: Bat pony (thestral) Gender: Mare Age: Young adult, early twenties Home: Thestraltown, Canterlot’s nocturnal district Former Occupation: Night Guard trainee Current Occupation: Dungeon delver and treasure hunter

Physical Description

Vesper bears the distinctive traits of a bat pony: leathery wings in place of pegasus feathers, tufted ears with exceptional auditory range, and small fangs visible when she speaks. Her coat is deep charcoal gray, her mane a darker midnight blue kept short for practicality. Her eyes are amber-gold, reflecting light sharply in low conditions. Her cutie mark is a pair of entwined twisters in muted purple and blue.

Her wings show extensive scarring along the membrane edges, pale and silvery where fire damage healed unevenly. The scar tissue puckers where the burns were deepest, limiting full extension. She often adjusts her wings without realizing it, a nervous habit formed after the injury.

The Defining Incident

One year ago, during a night patrol training exercise over Canterlot’s merchant district, Vesper spotted a warehouse fire. Without waiting for orders, she entered through a second-story window and found a family of four trapped by collapsed shelving.

She made three trips through thickening smoke, carrying out the two foals first, then guiding the parents down the stairs. On her final exit, a support beam collapsed. Fire caught her wings mid-flight and she fell into the street below, having saved all four lives.

The family still lives in Canterlot. The stallion now works as a baker, and Vesper occasionally finds anonymous boxes of apple fritters outside her door. She has never acknowledged them.

The Injury

The fire caused second and third degree burns across roughly thirty percent of her wing membranes. Immediate magical treatment prevented infection and total wing loss, but the healed tissue lacks elasticity.

Vesper can fly for about five minutes before cramping begins, escalating quickly into sharp pain. Full recovery requires roughly ninety minutes of rest. Gliding and short bursts are possible, but sustained flight always triggers the limit.

Cold weather stiffens the scar tissue and causes pain even while grounded. Humidity helps. Over time she has developed an instinctive awareness of her wing condition and constantly monitors early warning signs.

Washout from the Night Guard

Vesper was three months from graduation when the incident occurred. Her instructors, Princess Luna, and Guard medical staff praised her actions. She received a commendation for bravery and an honorable medical discharge with full benefits, along with the option to reapply for non-field positions.

Active Night Guard duty requires sustained aerial patrol and rapid long-distance response. Her flight limit made her ineligible, regardless of her combat training or night vision.

She was not disgraced. She was thanked, celebrated, and quietly removed from the only future she had ever planned for.

Personality and Psychology

Before the injury, Vesper was confident, ambitious, and driven. She grew up on stories of Luna’s return and the rebirth of the Night Guard. Joining felt inevitable.

After the injury, she became stubbornly determined and increasingly isolated. She frames her life as being between chapters rather than accepting permanent change. Dungeon delving serves a practical purpose, searching for magic that might restore her wings, but it also delays acceptance. As long as she is searching, she does not have to grieve.

She has developed a dry, dark sense of humor and prefers action to introspection. This makes her effective in dangerous situations and difficult in emotional ones. Her heroism remains intact, but it is now tempered by calculation. She still steps into danger for others, knowing exactly what it will cost her.

Skills and Abilities

Vesper uses echolocation to navigate absolute darkness, interpreting ultrasonic clicks with precision. Her night vision allows clear sight in conditions that blind most ponies, though bright light causes discomfort. Her hearing is exceptionally acute, capable of detecting conversations through walls and subtle shifts in air currents.

She completed most of her Night Guard training and is skilled in hoof-to-hoof combat, tactical assessment, and formation work. Her flight is limited to short, deliberate use. She has learned to function through pain, though she often delays admitting when she needs to stop.

Life in Thestraltown

Thestraltown lies within Canterlot’s northeastern districts, built into and beneath the mountain. Covered walkways and overhangs provide shade, and most businesses operate from sunset to sunrise. Vesper lives in a small studio apartment with an east-facing window. Watching the sunrise before sleeping is one of her few indulgences.

The neighborhood is working class and largely bat pony, with a growing number of other night-shift residents. Her parents and younger brother live three streets away. Her mother, Ashen Breeze, works nights as a nurse at Canterlot General Hospital. Her father, Shadow Stride, is a stonemason specializing in underground construction. Her brother, Gloom, is seventeen and undecided about his future.

Current Situation

Vesper has been delving for eight months, starting with minor sites like old aqueducts and pre-Equestrian ruins before taking greater risks. She prefers to work alone, telling herself it is to protect others, but avoiding witnesses to her limits matters just as much.

She is capable enough to survive, but she is pushing her luck. Companions might be what she needs most, if she can accept them.

Goals and Motivations

Her stated goal is to find magic capable of restoring full wing function. Beneath that is a refusal to accept that her injury defines her. Her unspoken desire is to find a purpose that feels as meaningful as the Night Guard, even if it is something entirely different.