Thras in Elder Scrolls: A Guide to the Coral Kingdoms

Thras is the coral island nation responsible for Tamriel’s worst catastrophe: the Thrassian Plague. Located in the Abecean Sea southwest of Summerset, this archipelago is home to the Sload, a race of grotesque, slug-like creatures who are masters of necromancy and disease. After their plague devastated the continent in the First Era, killing millions, the joint navies of Tamriel invaded and destroyed most of the islands. Today, Thras exists only in Elder Scrolls lore—you cannot visit it in any game.

Here’s what you’ll learn in this article:

• The Sload’s homeland and location
• The Thrassian Plague’s devastating impact
• How the All Flags Navy responded
• Why the geography constantly changes
• Sload culture and necromantic practices
• Transportation methods across the islands

What is Thras?

The Homeland of the Sload

Thras is the archipelago homeland of the Sload, a race of amphibious, slug-like necromancers. The Sload are a race of beastfolk, much like the Khajiit or Argonians. These creatures spend their youth in the water before moving to land as they mature.

The Sload have terrorized the Summerset Isles since before recorded history. Some scholars believe the oldest coral ruins found on Summerset suggest the Sload once controlled that land as part of a greater Thras kingdom.

Over millennia, they’ve conjured sea monsters, laid siege to coastal cities, and captured countless Altmer for unknown purposes.

The Sload’s mastery of necromancy sets them apart. They wage war with both magic and infernal machines, making them one of the most dangerous civilizations in history.

Their culture values slow, deliberate planning. This patience makes their attacks, which are often planned for centuries, calculated and devastating.

Location and Nicknames

You’ll find Thras southwest of the Chain and northwest of the Summerset Isles in the Abecean Sea (some sources call it the Sea of Pearls). The exact location is somewhat mysterious, with only rough maps showing its approximate position.

The archipelago goes by several names:

• The Coral Kingdoms – referring to its coral-based construction
• The Sloadlands – after its inhabitants
• The Thrassian Archipelago – its formal designation

The region is too small to be considered a continent on its own. It exists outside Tamriel’s political and cultural sphere, making it a truly foreign land.

Imperial authorities have historically classified it as a “free” or “wild region,” acknowledging their lack of control over the area.

A Moist and Volatile Kingdom

Thras has a wet climate that affects everything from the Sload’s mummification practices to the vegetation. When preparing corpses, the Sload need higher amounts of salt than normal due to the region’s humidity.

The archipelago centers around a brackish lagoon where the Sload move with surprising speed and grace. This central water body appears to be the only stable geographic feature of Thras.

An intricate network of coral formations and ancient shipwrecks provides pathways for the aquatic Sload to navigate.

The water and land exist in balance for the Sload. Young Sload develop essential survival skills in the lagoon before transitioning to land-based life as adults.

This amphibious nature makes Thras unlike any other known civilization in the Elder Scrolls universe.

A History of Plagues and War

Ancient Conflicts with Summerset

The Sload’s conflict with the Altmer of Summerset is older than recorded history. They have long used necromancy and bizarre machines to attack the elven homeland.

Some Altmer even took on aquatic forms during the formwars to fight the Sload on their own terms.

When Topal the Pilot’s fleet explored the western seas, one ship sent toward Thras never returned. Most historians blame the Sload.

The Sack of Skywatch in 1E 1301 brought particular horror to Summerset. The Sload captured numerous Altmer and transported them back to Thras.

The few who escaped described being held in the central lagoon, giving Tamriel its first detailed accounts of the archipelago’s interior.

These early conflicts established a pattern: the Sload would strike, capture victims, and retreat to their coral islands. This cycle continued for thousands of years until they unleashed their most devastating attack.

The Thrassian Plague

In 1E 2200, the Sload released the Thrassian Plague upon Tamriel. This disease killed more than half the continent’s population, with the western coastlands suffering the worst casualties due to their proximity to Thras.

The plague’s effects reshaped entire nations:

• Elsweyr collapsed from 16 kingdoms down to just 2
• Valenwood weakened enough to later fall to the Empire
• Hammerfell established friendlier relations with neighbors out of necessity
• Coastal cities lost the majority of their populations

Cases of the Thrassian Plague continued appearing near Wayrest over 400 years after the initial outbreak. The disease’s persistence made it one of the deadliest events in Tamrielic history.

The Sload’s motivation for releasing the plague is unclear. Some scholars suggest it was preparation for an invasion.

Others believe the necromancers simply wanted fresh corpses for their experiments. Whatever their reason, the plague united Tamriel against them like never before.

The Fall of the Sload

The response to the plague became known as the Fall of the Sload. Bendu Olo, the Cyrodilic Baron-Admiral, assembled the All Flags Navy—the largest joint naval force in Tamrielic history.

Every major nation contributed ships and soldiers to the cause.

The Navy sailed to Thras with a singular purpose: destroy the Sload completely. They slaughtered every Sload they could find and used powerful magic to sink the coral islands beneath the waves.

No one knows the exact magic they used, but it was powerful enough to sink the entire archipelago.

Tamriel believed the Sload were extinct. Bendu Olo earned the title “dealer of swift justice” to the Foul Spot of Thras.

Cyrodiil’s glory spread throughout the known world. The unified victory seemed complete.

But the Sload weren’t extinct. They survived beneath the waves, and their islands would eventually rise again.

The Re-Emergence and Later Eras

By the end of the First Era, the Sload had recovered enough to wage the War of the Uvichil from 1E 2911 to 1E 2917. This conflict ranks as one of the most terrible events in Tamriel’s recorded history, though details about it are scarce.

In 2E 864, Thras had definitively risen from the ocean depths. The Septim Empire classified it as a wild region and encouraged citizens to report any Sload sightings in Tamriel.

The slug-like necromancers had returned, though they kept a lower profile than before.

By 3E 402 to 3E 432, the western seas grew quiet. Agonio, the largest island, had grown considerably in size.

Many in Tamriel hoped the Sload had permanently retreated to their homeland, content to stay isolated.

Maps from 3E 120 in the Blue Palace’s Map Room showed Thras among other distant lands, confirming the Empire maintained at least basic knowledge of its location. Yet no major conflicts erupted, suggesting an uneasy peace.

The Unnatural Geography

The Fluctuating Archipelago

Early maps of Thras show sixteen islands arranged in a semicircle, similar to a partially submerged coral atoll. Later maps, however, show different numbers and sizes of islands.

This suggests the landmass itself is constantly changing.

This geographic instability might result from:

• Strong tides that submerge and reveal islands
• Necromantic influence reshaping the land
• Living coral that grows and dies
• Sload magic deliberately altering their homeland

Some scholars theorize the archipelago itself is a living organism. This would explain why it survived being sunk by the All Flags Navy and how it eventually rose again.

The Sload’s necromantic practices might sustain or control this organism, but this is only speculation.

Maps charted centuries apart show dramatic differences in Thras’s coastline. Islands appear and disappear. Sizes change.

Only the central lagoon appears consistently across all documented observations.

Agonio and the Central Lagoon

Agonio is the largest and most stable island in the archipelago. While other islands shift and change, Agonio appears consistently across maps—though it has grown considerably larger over the centuries.

The central brackish lagoon forms the true heart of Thras. Here, the Sload move through an intricate network of:

• Coral formations that serve as underwater highways
• Ancient shipwrecks providing structure and shelter
• Tidal channels connecting to the open sea

Captured Altmer who escaped Thras described this lagoon in detail. The water is neither fresh nor salt, creating a brackish ecosystem found nowhere else.

The Sload navigate it with surprising grace despite their awkward appearance on land.

Abnormally large nautiluses live in the waters surrounding Agonio. Scholars believe the island’s abundant resources allow these creatures to grow beyond normal sizes.

This suggests Thras has a rich, if alien, marine ecosystem.

The Pillar of Thras

The Pillar of Thras is a thousand-foot-tall spiral of coral on the largest island. The Sload use this structure for ritualistic sacrifices, throwing victims from the top.

Some victims die when they hit the rocks below. Others vanish moments before impact.

The Sload don’t seem to understand why some disappear and others don’t—or they don’t care enough to investigate.

Many scholars believe the Pillar is a portal to Oblivion. The victims who vanish might be transported to daedric realms rather than killed.

This would align with the Sload’s necromantic practices and their willingness to deal with dark forces.

The Pillar stands as the most recognizable landmark in Thras. Its spiral design differs from any natural coral formation, suggesting either magical construction or influence from another plane of existence.

Native Flora and Fauna

The Sload are the dominant species, but Thras hosts other life forms. The region’s sea monsters are either conjured through magic or bred naturally—sources disagree on this point.

The Sload keep necromantically animated sea creatures as pets:

• Reanimated turtles
• Undead crabs
• Other marine life killed and raised through necromancy

Tangerine Dragon Frogs have been documented in the region, though it’s unclear if they’re native to Thras or imported. The abnormally large nautiluses around Agonio represent the most documented native species beyond the Sload themselves.

The moist climate supports coral growth on a massive scale. Whether this coral is entirely natural or partially sustained through magic is debated.

Given how the entire archipelago sank and rose again, the line between natural and supernatural in Thras has blurred beyond recognition.

Sload Culture and Transportation

Myths, Necromancy, and Sacrifices

Sload heroic myths don’t celebrate warriors; they celebrate thinkers who “sit around and think for years.” Their legends praise caution and deliberation.

In these stories, the hero always wins because their plan was perfect. Conversely, villains are those who act rashly and always fail.

This cultural value system makes the Sload patient to a fault. When they do act, their plans have been refined over decades or even centuries.

The Sload are godless as a people, yet their priests commune with the God of Worms following the Warp in the West. This suggests opportunistic relationships with powerful entities rather than true religious devotion.

Necromantic practices dominate Sload society. They definitely practice necromancy on other races, both in Thras and Tamriel.

It’s unknown if the Sload practice necromancy on their own kind. The secrecy surrounding their culture makes definitive answers difficult.

The sacrifices at the Pillar of Thras reveal their willingness to kill without clear purpose. They don’t track which victims vanish versus which die, suggesting the act itself matters more than the outcome.

Travel by Spell

Young adult Sload lack essential surface survival skills and rarely appear on land. They stay in the water until they mature enough to transition to terrestrial life.

All land-traveling Sload know the Recall spell. They use it casually and frequently as their default mode of travel around Thras.

This magical teleportation eliminates the need for roads, bridges, or conventional transportation infrastructure.

The Recall spell allows a Sload to instantly return to a predetermined location. Given their patient nature and preference for staying in one place, this spell fits their lifestyle perfectly.

They can venture out when necessary and return home instantly once their business concludes.

This reliance on magic for basic transportation demonstrates how different Sload society is from other civilizations. Where other races build roads and develop trade routes, the Sload simply teleport between locations.

Sload Floaters and Sea Transit

Sload floaters are living airships that use intestinal gasbags for lift. These creatures serve as mass transit across Thras and potentially as weapons of war.

The floaters reportedly transport:

• Slaves from Tear (a city in Morrowind)
• Corpses from Senchal (a city in Elsweyr)
• Sload passengers across the archipelago

Abecean sailors sometimes find “sload-clusters” barnacled to their ships. These sailors beat the sloadbags to release “Thras gas,” which helps steer their vessels.

This suggests either symbiotic relationships or parasitic attachment, depending on perspective.

In the central lagoon, Sload move through the shipwrecks and coral with speed and grace impossible on land. Their buoyant bodies navigate underwater passages efficiently, making the submerged areas of Thras as developed as the surface islands.

Between their magic, living airships, and natural agility in the water, the Sload have perfectly adapted to their bizarre, ever-changing home.

Notable Sload in Elder Scrolls Games

N’Gasta

While Thras itself has never appeared in an Elder Scrolls game, one Sload has: N’Gasta, the necromancer from The Elder Scrolls Adventures: Redguard.

N’Gasta lived on an island in the Abecean Sea near Stros M’Kai. He was a powerful necromancer who enslaved souls and kept them trapped in his tower.

The player character, Cyrus, encounters N’Gasta while searching for his sister. The Sload’s lair is filled with the undead and dark magic, giving players a small taste of what Thrassian necromancy looks like in practice.

N’Gasta’s journal, found in the game, provides rare insight into Sload thinking. It reveals their obsession with soul magic and their complete lack of empathy for other living beings.

This encounter with N’Gasta is the closest any Elder Scrolls player has come to experiencing the horror of the Sload firsthand.