The Elemental Plane of Earth

The Elemental Plane of Earth is one of the four Inner Planes and the elemental source most closely associated with stone, soil, metal, crystal, and mineral matter.

Much of the plane consists of solid earth rather than open terrain. Caverns, tunnels, fissures, and other empty spaces form the regions most accessible to travelers from the Material Plane, while immense stretches of uninterrupted stone extend beyond them. Deeper into the plane, open spaces become increasingly scarce as elemental earth comes to dominate the environment.

The Diamond Bastion, domain of Durnathar, Primarch of Earth, lies deep within the plane.

Structure and Environment

The more accessible regions of the Plane of Earth contain enormous caverns, underground ranges, mineral deposits, and extensive networks of tunnels. Some resemble subterranean environments found on the Material Plane, though individual systems can extend across far greater distances.

Farther into the plane, caverns and fissures become less frequent. Stone, soil, crystal, ore, and other forms of earth grow increasingly continuous until solid matter occupies almost the entire surrounding environment.

The plane is not motionless. Its substance shifts slowly over time, producing tremors, collapsing passages, fractures, and earthquakes. Entire cavern systems can change as the surrounding stone moves or settles.

Deposits of metal, crystal, and gemstones are widespread. Some regions contain concentrations rarely encountered on the Material Plane, attracting miners, artificers, and other travelers willing to accept the difficulty of reaching them.

Caverns and Settlements

Most visitors remain within naturally occurring or constructed open spaces.

Caverns range from narrow passages to chambers large enough to contain settlements, lakes, or entire ranges of stone formations. Some are connected by tunnels created by native creatures, while others have been excavated by intelligent inhabitants.

Permanent settlements usually develop within stable caverns where movement of the surrounding earth is relatively predictable. Even these regions can change over long periods, however, and earthquakes may close established routes or expose passages that were previously buried.

Native creatures capable of moving directly through stone are far less dependent on tunnels and open spaces.

Movement and Travel

Movement is one of the greatest difficulties faced by visitors to the Plane of Earth.

Earth elementals and several other native creatures can pass through unworked earth and stone without leaving tunnels behind. Creatures without similar abilities must rely on existing caverns, excavation, magic, or native guides.

This makes conventional maps less reliable than they might appear. A marked passage may collapse, while two destinations separated by only a short distance through solid rock may require a much longer journey through connected caverns.

Teleportation and planar travel also require care. Arriving in an occupied space can leave an unprotected traveler trapped within solid earth. Established portals and known arrival points are therefore considerably safer than entering the plane without a specific destination.

Connections to the Material Plane

Natural vortices can form between the Plane of Earth and the Material Plane where elemental earth is particularly concentrated.

Mountain ranges are among the most common locations for these crossings, especially in regions of active geological change. Deep caverns, unusual mineral deposits, and areas affected by powerful earthquakes may also develop temporary connections.

Some vortices remain stable for long periods, while others open only during particular geological or magical events. Permanent portals are sometimes established around reliable crossings where regular travel or trade has developed.

Elemental Confluences

The boundaries of the Plane of Earth are not absolute. Where its substance mingles with the neighboring Elemental Planes, the distinction between one element and another becomes increasingly unstable. These confluence regions form part of what planar scholars collectively call the Elemental Chaos.

Where Earth mingles with Water, stone and soil become increasingly saturated. Water gathers in fissures and caverns, solid ground softens into mud and clay, and deeper regions can consist of heavy sludge, loose silt, or sediment suspended in water. Passages are prone to collapse as the surrounding earth loses cohesion, and surfaces that appear stable may give way without warning.

Where Earth mingles with Fire, temperatures rise and stone begins to soften and melt. Volcanic caverns, lava flows, magma chambers, and partially molten formations become increasingly common. Some regions consist largely of molten stone broken by pillars, shelves, or islands of solid earth, while others continually shift between solid and liquid states.

These confluences do not form separate planes. Their extent and conditions vary, and the balance between their contributing elements can change across enormous regions. Elemental creatures adapted to magma, mud, clay, silt, and other mixed forms of earth are commonly found along these boundaries.

Inhabitants

Earth elementals are among the most common native beings of the plane.

Their bodies are formed from stone, soil, and minerals, and they can move through unworked earth without disturbing it. This allows them to travel through regions completely inaccessible to most visitors.

Xorn are another well-known inhabitant. They can move through stone in much the same way and are particularly sensitive to the presence of valuable metals and gemstones.

Dao are also strongly associated with the Plane of Earth. They establish settlements and domains within its larger caverns and mineral-rich regions, and many traditions concerning earth genasi trace their ancestry to them.

Other creatures inhabit the plane as well, particularly within the more accessible caverns and elemental confluences. Much of the life deeper within the solid reaches remains unknown because travelers from the Material Plane have few ways to reach or observe it.

Language

Terran is the language traditionally associated with the Plane of Earth.

It is a form of Primordial spoken by dao, intelligent earth elementals, and many other inhabitants connected to elemental earth.

Its sounds are commonly described as low and resonant, carrying particularly well through stone and enclosed spaces.

Natural Hazards

The greatest danger on the Plane of Earth is the amount of solid material surrounding a traveler.

Cave-ins, earthquakes, shifting stone, and collapsing tunnels can trap creatures with little warning. Anyone caught away from an open space risks suffocation unless they possess magic or abilities that allow movement through earth.

Earthquakes vary considerably in strength. Minor tremors may loosen debris or damage structures, while larger events can close entire tunnel systems and reshape inhabited caverns.

Falling stone and unstable ground present additional dangers in recently disturbed regions. Mineral-rich areas may also attract powerful native creatures, making valuable deposits particularly dangerous places for outsiders to explore.

The Diamond Bastion

The Diamond Bastion is the domain of Durnathar, Primarch of Earth.

It lies deep within the Elemental Plane of Earth, surrounded by dense mineral formations and some of the oldest stone known within the plane.

The Bastion serves as Durnathar's principal seat of power and one of the four major elemental domains associated with the Primarchs.

Unlike settlements that depend entirely upon open caverns, portions of the Diamond Bastion are said to extend directly through solid earth. Native elementals and others capable of passing through stone can move between these areas without conventional corridors.

Survival

The Plane of Earth is difficult for creatures from the Material Plane, though many inhabited caverns can support ordinary life.

Air, food, and water may be available in settled regions, but they cannot be assumed to exist throughout the plane. Travelers moving away from established communities must prepare for long periods underground with limited access to supplies.

The greatest danger is becoming trapped within solid earth. Known portals, maintained tunnels, and settlements offer relative safety, while unexplored regions become increasingly hazardous as open space gives way to uninterrupted stone.

Deeper into the plane, creatures unable to move through earth become increasingly dependent on the rare caverns and fissures that remain. Along the boundaries with Water and Fire, conditions instead become increasingly mixed and unstable as Earth gives way to the elemental confluences of the Elemental Chaos.