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Thalassus is a sea monster that originates from the Wushanko Isles and is featured in the Deadliest Catch quest.

In the quest, the player, Jones and 'The Guns' sail out to the Northern Sea to try to catch Thalassus, who is terrorising all boats that pass by.

Jones has the player find a special harpoon, a sea chart, and a rower ('The Guns') to help aid their journey to sea. Once there, they follow a trail of wrecked boats to Thalassus's location to begin the hunt.

As Jones starts to throw his harpoon, Thalassus knocks Jones and the player overboard. Jones is swallowed alive while the player washes up on a nearby island. On the island, the player meets three mermaids. The mermaids reveal that they enjoy feeding humans to the Thalassus, and use it as protection.

After the player persuades them that Jones will kill them all once he's released, they reveal that if Thalassus is fed poisonous karambwan, he'll get sick and spit Jones out before he is slowly digested. After 'The Guns' feeds Thalassus karambwan, he releases Jones and swims away, though he manages to rip off one of the Thalassus' teeth as he is expelled out. Jones decides Thalassus is too hard for him to catch, so they row back to shore, where he decides to sell poisoned karambwan bait so that other seafarers can repel the Thalassus.

Some missions in player-owned ports involve hunting him, and some of them even involve actually befriending the beast.

Hunting Thalassus[edit | edit source]

After the quest, players can hunt Thalassus ten more times with increasing difficulty for Hunter experience, a total of 46,660 experience. To begin these hunts, talk to Jones outside the bank in the Fishing Guild. During the last three hunts, the sea wind will blow and disorient the player, rotating the camera's viewpoint. Players can easily correct for this by rotating back to face north. Once it has been hunted ten times, Thalassus will flee to another part of the sea and is unable to be hunted again.

Hunting the Thalassus 10 times after the quest is a requirement for obtaining the completionist cape and the master quest cape.

Difficulty Experience Mistakes Limited energy* Compass orientation
1/10 2,510 4 No No changes.
2/10 2,990 Yes
3/10 3,470
4/10 3,950 3
5/10 4,430
6/10 4,910
7/10 5,380
8/10 5,860 Wind changes compass orientation.
9/10 6,340
10/10 6,820 2
Total 46,660

* If the player turns their run energy off then no energy will be consumed. During the activity, 'The Guns' energy is equal to the player's run energy. The Oo'glog salt-water spring spa can be used for 10–25 minutes of practically infinite energy for 'The Guns' to use.

While the path changes for each hunt, the location of the shipwrecks is fixed. This blank map may be used as an easier way to track down the Thalassus. It is recommended to mark each shipwreck which leads the player along the trail.

Blank map for tracking down the Thalassus. (Up is North)

Salvaging Ships[edit | edit source]

Each time players hunt the Thalassus, they should aim for these items from the wreckage. They can only obtain one set of 16 blood runes, 5302 coins and 17 law runes each hunt but can get multiple uncut rubies, green dragonhides, and adamantite ores.

Item Value
Coins x 5302 5,302
Blood runes x 16 10,416
Uncut ruby x 1 1,224
Law runes x 17 6,970
Green dragonhide x 1 1,518

Jed Hunter[edit | edit source]

The Thalassus made a brief appearance in a tale of the Arc Jed Hunter, where it ate Jed "The Iron Link" when he tries to escape from the player.

Gallery[edit | edit source]

Achievements[edit | edit source]

  • Deadlier Catch (RuneScore.png 10) – Hunt the Thalassus until it flees for good. (X/11)

Update History[edit | edit source]

The update history project is a work-in-progress – not all updates to this topic may be covered below. See here for how to help out!
* patch 26 November 2013 (Update):
    • The wind will now affect the player during the later stages of hunting for Thalassus.

Trivia[edit | edit source]

One can collect loot while hunting.
  • The Thalassus was named by a player in the What's My Name? competition.
  • The word thalatta (θάλαττα) in Classical Greek, or thalassa (θάλασσα) in Modern Greek, means sea. της θαλάττης (thalattes) would therefore mean "the one of the sea", hence Thalassus.
  • According to the Live Q&A- Lore, the Thalassus and his mermaid guardians are creatures from the Eastern Lands.