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The Thalassus
Release date 7 June 2011 (Update)
Combat level 205
Race Giant fish
Members only Yes
Quest NPC Deadliest Catch
Location Northern Seas
Sells items No
Gender Male
Examine Argh! Run away!

Thalassus, named from the What's My Name? guaranteed content poll, is a massive fish 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. 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. Jones decides Thalassus is too hard for him to catch, so they row back to shore, thus ending the quest.

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

Hunting ThalassusEdit

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 you, rotating your camera's viewpoint. You 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.

Run number Experience New elements
1st 2510
2nd 2990 Limitations on 'The Guns' energy. *
3rd 3470
4th 3950 Only three mistakes allowed.
5th 4430
6th 4910
7th 5380
8th 5860

Wind changes compass orientation.

9th 6340
10th 6820

Only one mistake allowed.

Total 46660

* If the player turns their run energy off then no energy will be consumed. Note: During the activity, 'The Guns' energy is equal to the player's run energy. The Oo'Glog Salt Water 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.

Thallasus map

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

Jed HunterEdit

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

What's My Name?Edit

What's My Name? was a competition on the RuneScape Forums to name Thalassus.[1] The best selections were chosen and the names, on 20 May 2011, were put in a Guaranteed Content Poll. The option that received the most votes appeared in-game. Another name candidate, Crackjaw, was referenced in Deadliest Catch as a fantastical creature Linza and the other Signature Heroes had been duped into hunting in the wilderness.

Since man first grabbed a fishing rod and eagerly headed out to sea there have been tales of monsters from the depths. Creatures of gargantuan proportions as terrifying as they are a miracle of nature. Looking down into the deep dark water is enough for the bravest of fishermen to worry about what lurks below, watching and waiting for its next meal. Among the fishermen of RuneScape, one particular myth is so famous the name of the creature is synonymous with the fear of being out at sea alone. This creature has a veracious temperament towards humans, and it’s size makes it incredibly deadly. It’s been alive for thousands of years, digesting everything it comes across with no natural predators to fear. For those unlucky fisherman to be eaten, assuming they’re not sliced to pieces by its strong, sharp teeth all that awaits are several weeks of agonising pain as they are digested alive. What is this creature called you ask? It’s known simply as the...

Now it's over to you!

Deadliest Catch Forum



Wreckage loot

One can collect loot while hunting.

  • 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.


  1. ^ Mod Emilee. "GC - What's My Name? - Ideas." 09-May-2011. Future Updates Forums.

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