Every domain is an ecosystem. Its creatures, communities, weather patterns, and terrain all occupy functional niches — roles that define how energy, meaning, and willpower flow through the domain. This phase provides a systematic framework for populating your domain with interconnected inhabitants, from apex predators to parasitic flora.
The Five Functional Niches
The Niche Framework
Every creature, community, or environmental force in a domain fills one of five functional niches. When building or stocking a domain, ensure at least one entity occupies each niche. Complex domains may have multiple entities per niche, creating redundancy and competition.
Keystone
The entity whose presence defines the ecosystem. If removed, the entire web collapses or radically transforms. The Keystone is the ecological expression of the domain's core identity.
Relationship to Domain
Often the Symbol itself, the Partisan, or the domain's defining feature. Removing the Keystone triggers Instability.
Typical Forms
An ancient tree, a sentient weather pattern, the Partisan themselves, a ritual cycle, a dominant species, a founding artifact. An Egregore (autonomous thought-form), a Colostle (island-scale ecological giant), The Virtex (legendary spatial anomaly), Elder Egregores (multi-generational thought-forms anchoring domain identity).
Domain Zone
Usually occupies the Heart or Body zone. May extend influence into all zones.
Glass Menagerie Example
The Elder Glass — the original pane of enchanted glass from which all exhibits grew. Shattering it would collapse the habitat domes and release everything. Keystone + Anchor Object.
Predator
The entity that controls population and enforces limits. Predators prevent any single species or faction from dominating. They are the domain's immune system — dangerous but necessary.
Relationship to Domain
Enforces the ecological thesis through consequence. Often feared but respected. May serve Willpower directly.
Typical Forms
A territorial cryptid, bad weather that culls the weak, a faction that punishes rule-breakers, a disease, a scarcity cycle. A Vortex (spatial anomaly that devours the unwary), a Wendigo cryptid, Feral Hosmmes (crownless skeletons hunting in packs), Hivemind colonies (collective intelligence that polices overpopulation).
Domain Zone
Roams between zones or guards specific territory. Common in Margins and approaches.
Glass Menagerie Example
The Silence Between Exhibits — zones of absolute quiet where sound is consumed. They cull anything too noisy, too large, or too visible. They make the Menagerie a place of whispered observation rather than spectacle.
Scavenger
The entity that processes waste, death, and failure into something new. Scavengers are the domain's recycling system — they ensure nothing is truly lost. Without them, the domain accumulates spiritual and material debris.
Relationship to Domain
Transforms endings into beginnings. Often associated with Memory, Grief, or Renewal aspects of Willpower.
Typical Forms
A decomposer organism, grief-eating creatures, memory-recyclers, a faction that salvages and repurposes, a weather pattern that dissolves. Tulpas (feeding on fading willpower), Worker Homunculi (recycling domain debris into raw material).
Domain Zone
Common in Threshold and Secret zones. May follow Predators or haunt abandoned areas.
Glass Menagerie Example
The Catalog Spiders — arachnids that weave webs classifying everything caught in them. When an exhibit dies, the spiders incorporate its story into the domain's record. They scavenge meaning from death.
Symbiont
The entity that enhances other organisms through cooperation. Symbionts create mutually beneficial relationships — they are the domain's connective tissue, linking disparate elements into a functioning whole.
Relationship to Domain
Connects different niches. Often the mechanism by which the domain's thesis manifests — mutualism, communication, shared resources.
Typical Forms
A pollinator, a translator species, a trade network, a mycelial network, a shared ritual, a courier creature, a parasite turned partner. Zoons (sapient animal diplomats bridging communities), Echolalias (sonic creatures that attune disparate organisms), Symbiont Homunculi (maintenance drones that repair and enhance other creatures).
Domain Zone
Found in all zones; specializes in zone transitions and borders. The connective tissue.
Glass Menagerie Example
The Symbiont-Moths — creatures that clean whatever they attach to, removing parasites, dust, and emotional residue. The Docents rely on them to maintain exhibit health. In return, they feed on ambient curiosity.
Opportunist
The entity that exploits gaps and transitions. Opportunists thrive in disruption — they are the first to colonize new territory, the quickest to adapt, and the hardest to predict. They keep the ecosystem dynamic.
Relationship to Domain
Tests the domain's resilience. Opportunists push boundaries, challenge norms, and accelerate change. They are chaos agents — not malicious, just adaptive.
Typical Forms
An invasive species, a con artist, a migratory creature, a weed, a rumor, a Drift-touched creature, an artifact that spreads, a trend. Minor Vortices (small spatial tears that appear at disruptions), Cryptids (folklore creatures exploiting thematic gaps), Crowned Hosmmes (sapient skeletons seeking political leverage in unstable domains).
Domain Zone
Found at Margins and Thresholds; may be the first thing travelers encounter. Migrates between zones unpredictably.
Glass Menagerie Example
The Echo Parrots — mimic creatures that copy behaviors, appearances, and even emotional states. They infiltrate habitats and disrupt established patterns. Currently, some have started mimicking the Broadcast Spire's signals.
Niche Population Procedure
Populating a Domain Zone-by-Zone
Use the following procedure to populate each domain zone with ecologically coherent inhabitants. For each zone, roll or choose one entity for each applicable niche.
Zone Population Steps
Choose a Zone
Select one of the domain's zones: Heart, Body, Margins, Threshold, Secret. Start with the Heart.
Ask: What Is the Primary Niche Here?
Each zone has a dominant niche. The Heart is often Keystone territory. Margins favor Predators and Opportunists. Thresholds attract Symbionts. Secrets hide Scavengers. Use this as a starting point.
Define the Primary Inhabitant
Create or assign a creature, NPC, faction, environmental feature, or phenomenon that fills the primary niche. Use the Cryptid Creation process or draw from existing creatures.
Add One Secondary Inhabitant
Choose a different niche. Define a simpler entity — a creature, a plant, an environmental pattern — that fills it. This creates the first ecological relationship in the zone.
Define the Relationship
How do the primary and secondary inhabitants interact? Choose one:
Add Flora (Optional but Recommended)
Define at least one plant, fungus, or sessile organism for the zone. Flora provides environmental texture, potential resources, and subtle ecological connections.
Flora and Sessile Organisms
Plants as Ecological Infrastructure
The existing ecology system focuses on fauna and cryptids. But plants, fungi, corals, and other sessile organisms form the infrastructureof any ecosystem — they are the terrain, the resources, the shelter, and often the slow-burning threats that define a domain's texture.
Use the following catalog format to add flora to your domain. Flora entries are lighter than full cryptid entries — they are environmental detail that enriches the world.
Flora Catalog Format
Name: [Evocative name — describe what it does or looks like]
Type: Plant / Fungus / Coral / Lichen / Algae / Sessile Organism / Other
Niche: Keystone / Predator / Scavenger / Symbiont / Opportunist
Zone: Which domain zone(s) it occupies
Appearance: 1–2 sentences. What travelers notice.
Ecological Role: How it interacts with other organisms. What it provides or consumes.
Usefulness: Can travelers use it? As food, medicine, material, navigation aid, or information source?
Danger: Is it hazardous? Poisonous, parasitic, territorial, or psychoactive?
Willpower Link: How does its behavior connect to the domain's willpower or ecological thesis?
Example Flora
Grief-Bloom
Ossuary Orchard · Scavenger · Heart & Body
White flowers that grow only from decomposing organic material — bones, fallen leaves, shed skin. They release spores that accelerate decomposition, feeding the cycle. Tea brewed from their petals provides temporary clarity about one's own mortality (remove 1 Dread, gain 1 Insight). Picking them without offering something organic in return causes the picker's oldest possession to begin decaying. Links to the Orchard's thesis: decay is sacred.
Signal Kelp
Lantern Reefs · Symbiont · Body & Threshold
Bioluminescent kelp that pulses in response to emotional states of nearby creatures. Acts as a real-time mood map of the reef — blue for calm, amber for fear, green for curiosity, red for aggression. Reef communities use it to navigate social dynamics without direct confrontation. Touching a kelp strand while lying causes it to dim permanently. Links to the Reefs' thesis: confession purifies.
Archive Moss
Glass Menagerie · Scavenger/Symbiont · All zones
A soft, silver-green moss that grows on any surface that has been observed for long enough. Scraping it reveals faint imprints of everything that was once displayed or observed in that spot. The Docents harvest archive moss to reconstruct lost records. Eating it raw causes intense flashbacks of other people's observations. Links to the Menagerie's thesis:everything deserves to be seen.
Hush Fern
Glass Menagerie · Predator · Margins
A dark fern that absorbs sound within a 3-meter radius. Dense patches create zones of absolute silence. Smaller specimens are used as earplugs. In dense concentrations, they become lethal — suppressing heartbeat and breathing sounds, causing disorientation and suffocation in creatures that rely on hearing. A passive enforcer of the Menagerie's observation-over-spectacle ethos.
Mapping Ecological Relationships
The Relationship Web
Once you have populated your domain with inhabitants across niches, map their relationships. For each pair of significant inhabitants, define one relationship type:
| Relationship | Description | Story Hook |
|---|---|---|
| Predation | One consumes or destroys the other. | Protect prey, hunt predator, upset balance. |
| Mutualism | Both benefit from the relationship. | Protect the bond, exploit it, replicate it elsewhere. |
| Competition | Both vie for the same resources. | Choose sides, mediate, find alternatives. |
| Parasitism | One benefits at the other's expense. | Cure, embrace, weaponize, or spread. |
| Commensalism | One benefits; the other is unaffected. | Discover hidden dependencies or hidden costs. |
| Succession | One replaces the other over time. | Accelerate, prevent, or redirect the transition. |
| Dependency | One cannot survive without the other. | Rescue, sever, or exploit the bond. |
| Avoidance | Both actively maintain distance. | Force contact, discover the reason, broker peace. |
| Manifestation | One evolves into the other through accumulated belief — the Tulpa→Egregore lifecycle. The larval form feeds the mature form. | Accelerate, prevent, or redirect the evolution. Destroy the larval stage to starve the mature form. |
| Aggregation | Multiple entities merge into a single, more powerful form — the Vortex→Hivevortex→Virtex chain. Each absorbed entity adds power but reduces individuality. | Separate the aggregate, feed it to accelerate merging, negotiate with the dominant personality before it dissolves. |
Quick Population: d20 Entity Table
Random Ecological Entity Generator
Roll d20 twice — once for niche, once for form. Combine with the domain's seed and thesis to create a unique inhabitant.
d20: Niche + Behavior
1–4: Keystone (defines, anchors, stabilizes)
5–8: Predator (hunts, culls, enforces)
9–12: Scavenger (recycles, processes, transforms)
13–16: Symbiont (connects, enhances, trades)
17–20: Opportunist (exploits, adapts, disrupts)
d20: Form
1: Large predator beast or Wendigo Cryptid
2: Swarm of small creatures or Tulpa cluster
3: Sentient plant
4: Fungal network or Hivemind colony
5: Weather phenomenon or Vortex anomaly
6: Migratory herd or Echolalia chorus
7: Stationary guardian or Egregore
8: Parasitic organism
9: Colonial organism or Homunculus patrol
10: Solitary cryptid (Mothman, Spring-Heeled Jack)
11: Environmental hazard or Minor Vortex
12: Nocturnal hunter or Feral Hosmme pack
13: Burrowing species or Worker Homunculus workshop
14: Aerial or floating organism or Thunderbird
15: Aquatic or amphibious creature or Colostle
16: Mineral-based life
17: Light-based phenomenon
18: Sound-based entity or Echolalia nest
19: Memory or emotion feeder or Zoon diplomat
20: Hybrid or chimera (Tulpa evolving into Egregore)
Ecosystem Health and Domain Instability
Ecological Balance and Willpower
A domain's ecological health directly affects its Willpower stability. Use this framework to track and narrate ecological events:
- Stable ecosystem (all 5 niches filled): Willpower steady. The domain functions as designed. Normal weather, predictable behaviors.
- Niche vacancy (1 niche empty): Willpower fluctuates. One aspect of the domain is unregulated — expect overgrowth, unchecked predation, or spiritual debris accumulation.
- Niche collapse (2+ niches empty): Instability rises. The domain begins producing aberrant phenomena — species behave erratically, weather contradicts itself, zones blur.
- Keystone loss: Existential threat. The domain's identity destabilizes. If not addressed, the domain may fracture, merge with an adjacent domain, or descend into the Null.
Recovery paths: PCs can restore ecological health by introducing new organisms into empty niches, brokering relationships between competing species, or performing rituals that renew the Keystone's connection to the domain.
See Also
Phase 3: Community & Factions
Social organisms — Anchor Communities, Toxic Powers, and faction symbology.
Phase 5: Blessing & Curse Design
Design blessings and curses that emerge from the ecological web.
Ecology & Settlements
Biomes, weather, flora, fauna, and settlement scales.
Cryptozoology
Cryptid creation — Exaltations, behaviours, summoning conditions.
Domain Creation Guide
Domain Zones — Heart, Body, Margins, Threshold, Secret.
Bestiary
The complete creature catalog — stat blocks and domain affiliations.
Expanded Bestiary
Egregores, Tulpas, Cryptids, Homunculi, Colostles, Vortices, Zoons, Hiveminds — all mapped to ecological niches.