ESO High Seas of Tamriel Event Guide

Article

Up to date for: Update 51 - 11th September 2026

Last changed: Update 51 - 11th September 2026

The High Seas of Tamriel event runs from September 30 through October 14, 2026, two days after Update 51 launches on September 28. It begins with the Raising the Riotous Redress quest which unlocks the repeatable Bounty of the Abecean Sea daily quest.

Completing an event quest (including prologue) gives you 300 Trade Bars per account each day.

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How to Start High Seas of Tamriel

Complete Raising the Riotous Redress to restore the ship and unlock the daily quest.

Raising the Riotous Redress

Tamriel

Gold Coast

Sunken Cavern

Baron-Captain Olsien Guy Mard

Kvatch

Start the quest

Accept Raising the Riotous Redress from the Quest Starters section of the Crown Store, or speak to Baron-Captain Olsien Guy Mard on the Gold Coast beach just outside Anvil.

Baron-Captain Olsien Guy Mard sends you after the enchanted bell that can bring the sunken Riotous Redress back to the surface.

The quest starter can be found in the Crown Store for free.
Recover the fractured bell

Travel north-northwest along the coast toward the Ayleid ruins and follow the Hadolids into Sunken Cavern.

Defeat Clagkrack the Covetous Claw, then take the Fractured Ship's Bell from the debris behind him.

The cavern entrance is underwater beside the Ayleid ruins.

Take the bell after defeating Clagkrack.
Return the damaged bell to Baron-Captain Olsien Guy Mard

Take the Fractured Ship's Bell back to Baron-Captain Olsien Guy Mard on the beach. He notices that its clapper is missing and sends you to have the bell repaired.
Ask Ulene Teneran about the bell

Take the fractured bell to the Eight Blessings in Kvatch and speak with Ulene Teneran.

Ulene directs you to Tuindoril in the hedge maze in western Kvatch.

Kvatch Ulene Teneran Tuindoril
Have Tuindoril restore the bell

Find Tuindoril in the hedge maze in western Kvatch. Ask him to restore the enchanted bell.
Restore the Riotous Redress

Return to the beach outside Anvil and ring the repaired bell. Once the Riotous Redress surfaces, speak with Baron-Captain Olsien Guy Mard to complete the quest.

The prologue awards that day's 300 Trade Bars, so you do not need to complete the daily voyage on the same day if that is all you care about.

Bounty of the Abecean Sea Daily Quest

Starting the Daily

After completing Raising the Riotous Redress, use the ship's logbook on the beach to start Bounty of the Abecean Sea.

Riotous Redress Logbook with the Open the book interaction prompt — Use the Riotous Redress Logbook to start the daily.

Ship Battle

An enemy ship attacks the Riotous Redress after you set sail.

Enemy Ship alert at the start of the battle aboard the Riotous Redress — The alert shown at the beginning of the encounter.

Sink the Enemy Ship

Fire the Riotous Catapults whenever the attacking ship moves into range. It took 10 catapult shots to sink the ship during my solo run.

A usable catapult glows yellow and offers the Fire prompt
The game warns Hold your fire - enemy ship is moving.
That warning is misleading because the next catapult can glow and become usable as soon as the ship starts moving into position

A Riotous Catapult glowing yellow and ready to fire — A yellow glow means the catapult is usable.

Boarders and Hull Breaches

Louse-Whisperer boarders attack you and the friendly Ghostly Crew between catapult shots. Kill the boarders and any Champions, then use Repair on Hull Breaches.

You cannot go below deck. Despite their name, Hull Breaches are glowing fireballs on the top deck. You lose the battle if five Hull Breaches are present at the same time.

Baron-Captain on Deck requires 10 catapult shots and 10 Hull Breach repairs. Ending the Louse-Whisperers requires 10 Champion kills.

The Bosun, a Louse-Whisperer Champion, fighting on the deck of the Riotous Redress — The Bosun add which counts for Ending the Louse-Whisperers.

A Hull Breach with the Repair interaction prompt on the top deck — A Hull Breach

Winning the Ship Battle

There are two ways to win the ship battle:

Outlast the attacking ship by repairing breaches and killing boarders until it withdraws, awarding one Abecean Spoils of War chest
Sink the attacking ship with the catapults, awarding two Abecean Spoils of War chests

Abecean Spoils of War can contain tradeable Antiquity Leads and a Sack of Pirate Gold. The sack has a very rare chance to contain 1,000,000 gold. There is also a small chance to receive a High Seas furnishing or a High Seas Antiquity Lead. They also contain random gear, treasure, and crafting materials.

Contents of an Abecean Spoils of War chest from a ship battle — Abecean Spoils of War

Entering the Abecean Depths

After the ship battle, collect the Post-Battle Flotsam and use the Dwemer Diving Chamber aboard the Riotous Redress. The chamber takes you to the sea floor inside a protective bubble.

The Dwemer Diving Chamber aboard the Riotous Redress with The Abecean Depths interaction prompt — Use the Dwemer Diving Chamber after the ship battle.

Avast! A Harpoon tutorial explaining how to use the underwater harpoon — Harpoon the marked stalactite to continue the descent.

Look above the Dwemer Diving Chamber and harpoon the marked stalactite to continue. The same stalactites appear in Leviathan's Gullet, where dropping them closes vents and opens the path.

Underwater Mechanics

Dwemer Diving Bubble

Your Bubble Popped! Get to a Clam! alert beside a glowing green clam — Walk into a glowing green clam to restore your bubble.

When your bubble pops, you start taking damage. Enemy attacks, hydrothermal vents, and the tornado-like Reef Shark attacks can pop it.

Walk into one of the glowing green clams to restore your bubble. You do not need to interact with the clam.

Harpoon

The Harpoon is used on Vent Blockages and stalactites:

Some Vent Blockages cover glowing green clams. Harpoon the blockage, then walk into the clam to restore your bubble
Other Vent Blockages cover hydrothermal vents. Harpoon the blockage to uncover the vent. Walking into it pops your bubble. During Lucky Gretch, lead her over an active vent to remove her Bubble Barrier
Harpoon stalactites in Leviathan's Gullet to close vents and clear the passage

Abecean Depths Locations

The Abecean Depths has two maps and two caves. You begin beside the Dwemer Diving Chamber on the first map.

Map of the First Underwater Area in the Abecean Depths

Map of the Second Underwater Area in the Abecean Depths

Map of Krelzimar's Den in the Abecean Depths

First Underwater Area

Coral Forest and Ornaug Grotto don't have any unique mechanics, just adds.

Leviathan's Gullet

Open vents block the route through Leviathan's Gullet. Look above them for marked stalactites, then harpoon the stalactites to close the vents and open the passage.

Lucky Gretch's Basin

The boss here is Lucky Gretch, a Haj Mota with 327.3k Health. She periodically charges into clams to gain a Bubble Barrier, which makes her immune.

Harpoon the nearby Vent Blockages to uncover the hydrothermal vents, then lead Lucky Gretch over an active vent. The vent pops her barrier and lets you damage her again. The same vent can also pop your bubble.

Lucky Gretch over an active hydrothermal vent after her Bubble Barrier breaks — Move Lucky Gretch over an open vent to burst her Bubble Barrier.

Haj Mota Cavern

Bright Bazzle

Inside the cavern, Lucky Gretch joins Bright Bazzle, another 327.3k-Health Haj Mota, and several Haj Mota Hatchlings.

Kill Bright Bazzle first. Killing him also kills Lucky Gretch and every remaining hatchling. Killing Lucky Gretch first enrages every other enemy.

The northern exit from Haj Mota Hunting Grounds leads to the next area.

Bright Bazzle waiting inside the Haj Mota cavern — Kill Bright Bazzle before Lucky Gretch.

Second Underwater Area

This area splits into two paths that rejoin at the cave leading to Krelzimar's Den.

Wreck of the Sea Demon

There are no unique mechanics inside the Wreck of the Sea Demon, just adds and Undersea Treasures.

Reef Shark Run

A Reef Shark Attack forming beneath the player with the Get to a Clam warning — Reef Shark attacks can pop your bubble.

Reef Shark Run is one of the two paths through the second underwater area. Reef Sharks charge at you when you enter their outer ring, and if they touch you with their inner circle, your bubble pops. They leave you alone and return to their patrol route if you stand in one of the glowing green clams.

Krelzimar's Den

Krelzimar

Krelzimar has 358.5k Health and becomes immune at roughly 66% and 33% Health. The immunity ends on a timer after each explosion phase, so killing the spawned Yaghra does not remove it early.

An AoE covers the arena floor while a geyser erupts from a glowing circle. Standing in the geyser gives you Upthrust, launching you up for five seconds which allows you to avoid the explosion. The explosion only dealt roughly 20k damage on the lowest difficulty, so I could survive it without using the geyser.

The player launched above Krelzimar’s Toxic Cloud by the Upthrust geyser — The geyser keeps you airborne for the Toxic Cloud explosion.

Captured Systres Zephr, a fragment for the Suncleft Grotto Ornaug mount, dropped for me on my first Krelzimar kill.

The Golden King's Treasure

Examine The Golden King's Treasure to complete the underwater objective, then use the southern exit. This returns you to the first underwater area near the Dwemer Diving Chamber.

Messages in Bottles

Eight Messages in Bottles are scattered throughout the underwater areas. You only need to find four to complete the Wave-Tossed Missives achievement.

Bottle numbers match their order in Wave-Tossed Missives. They have a faint glow but can still blend into coral and wreckage.

First Underwater Area

Haj Mota Cavern

Second Underwater Area

Krelzimar's Den

Message	In-game Hint	My Note
1. Under Attack	“Beneath a Wall of Fossil Shells”	On the first underwater map, under the spot where you return after defeating Krelzimar
2. The Stars Led Me Here	“Atop a Rocky Arch”	I couldn't find it
3. The Island Appears at Dawn	“Across from a Sea Beast's Skeleton”	Inside the Ornaug cave, across from the sea beast skeleton
4. The Curled Key	“Where Turtles Nest and Lair”	Inside the Haj Mota cavern, beside the egg-filled nest
5. The Song the Ocean Sings	“At the Stern of a Cursed Pirate Wreck”	On the back of the Wreck of the Sea Demon
6. Shallows of the Abyssal Sea	“Surrounded by Schools of Deadly Fish”	On the bones in Reef Shark Run
7. Shadow Over the Midday Sun	“Where Krelzimar Lairs”	Inside Krelzimar's Den, in a narrow gap between fossil shells
8. Gold Colder than the Sea	“On A Rise Near Red Coral and Massive Bones”	On top of the massive bones beside the red coral

High Seas of Tamriel Rewards

Daily Deep Plunder Boxes

The first High Seas quest completed per account each day gives a Legendary Deep Plunder Box and 300 Trade Bars. After that, each character can earn one Epic Deep Plunder Box from another High Seas quest that day.

Legendary Deep Plunder Boxes can contain Abecean Sea Privateer Weapon Style Pages.

Galen Seawater, one of the three Suncleft Grotto Ornaug fragments, can drop from Legendary Deep Plunder Boxes.

Both Legendary and Epic Deep Plunder Boxes can contain:

Motif style items, crafting materials, crafting upgrade materials, provisioning ingredients, Alchemy reagents, and Enchanting runestones
Equipment or group repair kits
Antiquity Leads from other zones
Treasure maps
Excavation and Scrying XP scrolls
A small chance for High Seas furnishings

A Deep Plunder Box containing an Abecean Sea Privateer Axe style page, an Antiquity Lead, a treasure map, repair kits, and Pitch, with 300 Trade Bars awarded — Legendary Deep Plunder Box

Abecean Spoils of War

After the ship battle, Post-Battle Flotsam appears in the water off the side deck. Fish from it to pull up your Abecean Spoils of War chest.

The ship battle awards one Abecean Spoils of War chest if you outlast the attacking ship, or two if you sink it with the catapults.

Abecean Spoils of War can contain tradeable Antiquity Leads, random gear, treasure, crafting materials, and a Sack of Pirate Gold. The sack has a very rare chance to contain 1,000,000 gold. Abecean Spoils of War also have a small chance to contain a High Seas furnishing or High Seas Antiquity Lead. Tradeable Antiquity Leads are only for sellable treasures.

Undersea Treasures

Undersea Treasures can appear as direct chests or Dirt Mounds. Dig Up a Dirt Mound to reveal either a chest or a Gigantic Clam. Direct chests, Dirt Mounds, and Gigantic Clams use the same loot table.

The underwater areas also contain regular Giant Clams. They have the same loot as Giant Clams in Summerset and are not marked on these maps.

Undersea Treasures can drop High Seas furnishings, Furnishing Plans, High Seas Antiquity Leads, and tradeable Antiquity Leads.

An underwater Dirt Mound with the Dig Up interaction prompt — Dig Up the Dirt Mound.

A chest uncovered from an underwater Dirt Mound — A chest uncovered from a Dirt Mound.

A Gigantic Clam uncovered from an underwater Dirt Mound — A Gigantic Clam uncovered from a Dirt Mound.

The green circles show 16 possible Undersea Treasure spots I have recorded so far.

Ostentatious Pirate Wig and Hat

You get the Ostentatious Pirate Wig and Hat for completing Raising the Riotous Redress, the introductory quest for the event.

Abecean Sea Privateer Weapon Styles

Abecean Sea Privateer Weapon Style Pages can drop from Legendary Deep Plunder Boxes or be purchased from the Impresario during the event.

Weapon Preview

Weapon	Preview
Battle Axe
Maul
Greatsword
Axe
Bow
Dagger
Mace
Shield
Staff
Sword

Suncleft Grotto Ornaug Mount

Combine all three fragments to unlock the Suncleft Grotto Ornaug.

Fragment	Source
Galen Seawater	Legendary Deep Plunder Box Awarded for completing the daily voyage
Captured Systres Zephr	Undersea bosses
Arcing Ornaug Energy	Flight of the Albatross achievement

Furnishing Antiquities

High Seas adds eight Antiquities that award furnishings and two that award Furnishing Plans.

Abecean Spoils of War can drop High Seas Antiquity Leads. I found the Cursed Ship's Bell Lead in an Undersea Treasure.

Furnishings

Antiquity Preview

Antiquity	Preview
Ship in a Bottle, Yokudan
Cursed Ship's Bell
Fossil, Mudcrab
Fossil, Mud Hopper
Fossil, Slaughterfish
Fossil, Yaghra
Fossil, Giant Fish Tail The furnishing itself is called Fossil, Giant Sea Beast Tail.
Fossil, Giant Fish Head The furnishing itself is called Fossil, Giant Sea Beast Head.

Furnishing Plans

Antiquity Preview

Antiquity	Preview
Sketch: Ancient Dwarven Mechanism
Praxis: Fountain, Grand Seashell

Direct Furnishings

High Seas furnishings can drop from Deep Plunder Boxes, Abecean Spoils of War, undersea bosses, and Undersea Treasures. Deep Plunder Boxes and Abecean Spoils of War only have a small chance to drop one. The exact source for each furnishing is still unconfirmed.

Furnishings

Furnishing Preview

Furnishing	Preview
Dwarven Diving Chamber, Replica
Aquarium, Conjured Sphere
Bountiful Treasure Chest
Book, Ship's Log
Pirate Flag, Sea Elf
Golden King of the Abecean Sea
Ship Figurehead, Yokudan
Driftwood Sculpture, Large

Furnishing Plans

Furnishing Plans drop from Undersea Treasures.

Plan Preview

Plan	Preview
Blueprint: Driftwood Bowl
Blueprint: Driftwood Divider, Folding
Blueprint: Driftwood Arrangement, Hanging
Design: Scrimshaw, Horn
Design: Scrimshaw, Skull
Design: Scrimshaw, Tooth
Praxis: Sandcastle, Abecean Seafloor
Formula: Fish Bowl, Small
Blueprint: Driftwood Archway

Fishing

Abecean Saltwater Fishing Holes appear off the Gold Coast near the Riotous Redress. Catch all four rare fish to complete High Seas Master Angler.

The in-game Help entry says Abecean Saltwater Fishing Holes appear around the ship after defeating Krelzimar and claiming the Golden King’s treasure. That is not what I observed. They were already present off the Gold Coast on a character that had not completed the prologue.

Gold Coast