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Sea Slug OSRS: Uncovering The Truth

By Jesus Marquez | Created: December 20, 2023 | Last updated: May 09, 2025 | Read Time: 6 minutes

It’s time to solve a mystery! The Sea Slug quest in OSRS is part of the Temple Knight series, being the third quest that follows the line. You will need to discover what happens on the Fishing Platform because there is a missing fisherman and the presence of a dozen strange sea creatures. OSRS Sea Slug will take you on a journey to find the truth before it’s too late. Are you ready to jump into the sea to find out what happened? 

OSRS Sea Slug Requirements

In OSRS, How To Do Sea Slug may be a question on your mind; that’s why we are here to tell you all you need to know for a successful quest. Sea Slug is Member only, and it’s short in length, however, it’s listed as an intermediate difficulty, meaning you must be careful while doing this quest. Outside of that, here are all the requirements you will need to complete Sea Slug in OSRS:  

  • 30 Firemaking 
  • Swamp paste (made by mixing flour with swamp tar and then cooking the mixture on a fire; can also be bought from a Trader crewmember for 75 coins, from Rasolo for 60 coins west of the Fishing Guild, or from the Khazard General Store for 42 coins at full stock)
  • Small fishing net for Ardougne Medium Diary (can be bought near quest start in Witchaven)
  • Unlit torch (a small glitch might occur where you do not receive the torch during the quest)

Thankfully, you won’t need to fight against any enemies, but you will have to have unlocked the Kandarian area. Outside these simple requirements, consider some food, but that shouldn't be an issue, as it's always something to be considered. 

sea slug osrs

Sea Slug OSRS: A Complete Walkthrough

To begin with this quest, you must speak to Caroline, located north of Witchaven, east of Ardougne on the coast. When you start the conversation with her, she will tell you that her husband, Kent, and her son, Kennith, are missing.

The Fishing Platform

Caroline will ask you to go to the Fishing Platform to find them. She will also mention that Holgart has a boat that can perhaps take you. Once you finish speaking with her, your next OSRS Sea Slug task is to talk to Holgart. He will tell you his boat needs repairs before it can sail. Part of this request to fix the ship is getting him Swamp paste. You can buy the Swamp paste in the Grand Exchange since it’s the fastest way to get this item. However, you can go to the General Store in Port Khazard; you can find this south of Ardougne; it’s guaranteed you find the source. 

You can also take a ship to Brimhaven from Ardougne, or if you prefer, you can teleport there instead of using the boat. Once you are there, buy some Swamp paste from a Trader Crewmember. This method will cost you 60 extra coins for the trips. 

Come back and give Holgart the Swamp paste (You can’t use Swamp tar, but you can mix this item with flour and cook it with fire to get the Swamp paste). Once you have done this, a cutscene will appear, showing you how Holgart is fixing the damage to his boat. After this, your next task in Sea Slug OSRS is to talk to him again and go to the Fishing Platform. 

sea slug osrs

In-Depth Investigation

Upon your arrival on the Fishing Platform, you will immediately notice something odd, and you can perceive everyone's weird behavior. All the people in there will look like zombies in a trance. You must avoid interacting with the Sea slugs because they will deal 3 points of damage if you pick one up. 

Before continuing with your Sea Slug Quest in OSRS investigation, take a moment to catch a fish to complete the task for the Ardougne Medium Diary. 

After you've done so, look around, and you'll spot Bailey. He’s inside a small room on the southwest corner of the platform. You have to talk to him, and he will tell you what is happening and about the hauling up of the sea slugs. Here, you must pick up the Broken glass on the floor because you will need it later for this quest. 

Helping Kennith and Kent

After the conversation with Bailey, your next task in Sea Slug OSRS is to pick up some Damp sticks located close to the ladder in the northeast corner of the platform. Climb up the ladder, and upstairs, on the west side, it’s a room where you will find Kennith. He will immediately tell you that his father was trying to leave this place days ago, but the fishermen stopped him from doing so. Caroline’s son will ask you to find his father and help him. 

You will need to come back to where Holgart is and talk to him again. This time, you will head to a desert island. There, you will find a stranded Kent. Head over and speak with Kent; he will tell you the story and everything that happened. Get back to Holgart and ask him to take you to the platform again.  

Upon arrival on the Fishing Platform in this Sea Slug quest in OSRS speak to Bailey to find the slug’s weakness. You will notice that slugs are afraid of heat. He will give you an Unlit torch because he can’t light it since it’s too damp. You will need to use the Broken glass on the Damp sticks to dry them and be able to rub them together to light the torch. Don’t try to go upstairs without lighting the torch first; all the fishermen will attack you. 

With the torch in your hand, climb the ladder again, the one located on the northeast part of the platform. Go into the room, and talk to Kennith again. You will need to kick the badly repaired wall to make a hole you can use to escape. Use the torch on the fishermen or the Sea slugs to make him go away and speak with Kennith one more time. You will need to rotate the crane to save him, as shown in the cutscene. 

After the cutscene ends, it’s time to talk to Holgart to take Kent, Kennith, and you back to the shore. When you arrive at the shore of Witchaven, talk with Caroline, and the quest is complete. 

osrs sea slug

Sea Slug OSRS Rewards

What an adventure saving this family from the Sea Slugs and the Fishermen. It’s great to know people can count on you for these endeavors. For your good heart and dedication, here are your rewards after completing Sea Slug in OSRS: 

  • 1 Quest point
  • Fishing 7,175 Fishing experience
  • Access to the Fishing Platform
  • Oyster pearls

It can be a small reward, but you can always get a little treat for yourself, buying gold to help you cover all the necessities you come across playing Old School RuneScape. It is worth the try, and you will love how easy your life will get after doing it.  

Sea Slug OSRS FAQ

Do you still have doubts about this quest? Let us give you the answers you need. Here are some questions and answers to ease your experience through Sea Slug quest: 

How Can Sea Slugs in OSRS Control The Mind? 

They are a race of slugs that can control the minds of humans by latching onto them. The Slugs first appear on the Sea Slug quest when they attack the Fishermen; here, you can see how they can control their minds, creating a zombie-like host. 

What Are The Other Quests in The Temple Knight Series? 

For this series, there are only four quests: Recruitment Drive, Wanted, Sea Slug, and The Slug Menace. 

How Do You Light A Torch in OSRS Sea Slug?

You will need to use the broken glass and the Damper stick. Once they are dry, rub them together to light the torch before continuing with the quest. 

A Summary: Sea Slug OSRS

The first contact with the Sea Slugs may seem weird in itself, so keep your eyes peeled, as you will be seeing them again in the near future. Keep an eye open in our blog section to get more guides and walkthroughs like this one soon. If you're looking for something to read in the meantime, why not take a look at our latest title and we'll be back soon with even more exciting adventures.


Author profile
Jesus Marquez

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