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Old School RuneScape uses the British convention for floor numbering: Ground floor, first floor, etc.
Instruction manual
This quest has a quick guide found here.
It briefly summarises the steps needed to complete the quest.


Details

Start point Quest point icon Talk to Sigmund in Lumbridge Castle.
Official difficulty Intermediate
Description Sigmund is the advisor to the Duke of Lumbridge, but the duke does not always take his advice.

When part of the cellar wall collapses the duke insists the damage was caused by an earthquake, but Sigmund is worried about a monster attack.

If you investigate this mystery it will lead you through treacherous caves to uncover something lost by the Gods for thousands of years.

Length Medium
Requirements
  • Completion of Goblin Diplomacy and Rune Mysteries (Goblin Diplomacy can be completed when speaking with the goblin generals as part of The Lost Tribe quest; it is not required to start The Lost Tribe.)

Note: (Goblin Diplomacy can be completed when speaking with the goblin generals as part of The Lost Tribe quest; it is not required to start The Lost Tribe.)

Items required

Recommended:

Enemies to defeat None

Walkthrough

Crashing in the cellar

Start by talking to Sigmund.

Talk to all of the people in Lumbridge, including Duke Horacio, the cook, Hans, Father Aereck, Donie, Bob, as well as anyone else you find. One of them will tell you that they saw a goblin with huge eyes in the castle basement. Note: Once someone has told you that they saw a goblin, you do not need to question anyone else.

The Lost Tribe - the goblin brooch

Finding the brooch.

Report this to the duke. Sigmund will join in on the conversation, which will be slightly different if you have completed Dragon Slayer. After the conversation is finished, you'll be able to go down to the basement and use your pickaxe on the rubble.

Go down the trapdoor in the kitchen, and look for a blocked tunnel (rubble) on the east side of the cellar. Use your pickaxe on it. Light your light source, then squeeze through, grab the brooch, and turn back. Otherwise, you'll fall into a pit.

Go back to the duke and show him the brooch. You will be asked to show it to Reldo in the library (located north of the ground floor) in Varrock Palace.

Investigating in the library

The Lost Tribe - goblin symbol book location

The bookshelf where the book is located

Show the brooch to Reldo, the librarian. He'll tell you to search the bookcases for a book on goblin history. The book is at the northwestern portion of the room - the furthest up the west wall of the room.

Turn to the last page to see that the symbol on the brooch translates to "Dorgeshuun, goblins of the strong spears". Keep the book for the remainder of the quest since it's very important.

Goblin history

Head to Goblin Village, and talk to General Wartface and General Bentnoze. They'll argue about minor things just like they did in Goblin Diplomacy but eventually teach you the goblin victory dance and ceremonial bow emotes.

During the dialogue with the Generals, you should choose the following options:

The Lost Tribe - goblin generals teach greetings

The goblin generals teach the player the goblin greetings.

  1. Have you ever heard of the Dorgeshuun?
  2. It doesn't really matter
  3. Well either way they refused to fight
  4. Well I found a brooch underground...
  5. Well why not show me both greetings?

You will then receive confirmation you've learned both emotes. Double check your emote page to be sure, then move on to the next section.

The tunnel system

Dorgeshuun Tunnels

A map of the tunnels.

Go back to Lumbridge, and talk to the duke. He will tell you to investigate the caves further. Go back into the tunnel. See the map for the correct path. If you go the wrong way, one of two things will happen:

The Lost Tribe - tunnel symbol

One of the symbols on the rock.

  1. A rock will fall in front of you or on top of you (if you're lucky).
  2. You'll fall down a trapdoor and end up in the main part of the Lumbridge Swamp Caves. If you're using a candle, you will almost certainly die because the candle will constantly cause gas explosions, so use the Home Teleport or another teleport. (Alternatively, you can try to find your way back through the hole you created earlier, using food and Prayer as necessary.)

The way through the cave is the same for all players. See the map.

Contact

When you reach the end, you'll find the Dorgeshuun tribe. Talk to Mistag, and do your Goblin Bow in front of him. He will tell you that the Dorgeshuun are actually peaceful, and the Lumbridge kitchen thing was an accident. You'll also learn about the goblins' backstory. Mistag will offer to take you back to Lumbridge if you ask him to show you the way out. Agree.

Missing silverware

The Lost Tribe - H.A.M. cult location

Trapdoor location

Speak with the duke. Some silverware was stolen from the castle basement, and the goblins are being blamed for it. Pickpocket Sigmund and unlock his chest (located in the spinning wheel room) to find some H.A.M. robes (keep them as you'll need these for Death to the Dorgeshuun, the sequel quest).

The Lost Tribe - silverware location

The silverware!

The Lost Tribe - the peace summit

The meeting between Duke Horacio and Ur-tag.

Tell the duke that Sigmund is part of Humans Against Monsters. Then exit through the west side of Lumbridge castle and go to the H.A.M. Hideout (the trapdoor is directly west of the general store; pick the lock, YOU DO NOT NEED A LOCK PICK). You will find the stolen silverware in the crates in the first room. Give it back to the duke, who will fire Sigmund.

Peace

The duke will give you a peace treaty. He will sign it and tell you to get the leader of the Dorgeshuun to sign it as well. Go into the tunnel. This time, you won't have to navigate through yourself because you'll see a new goblin there, Kazgar, that you will follow to the mines.

Audio options icon
Peace summit (link)
The music track that only plays during the cutscene.

Talk to Mistag. He'll get the leader to sign it in the Lumbridge dining room with you and Mistag as witnesses. After the signing, you will see Sigmund outside, saying that the goblins will soon be destroyed. This leads to the sequel quest, Death to the Dorgeshuun.

Congratulations! Quest complete!

Rewards

The Lost Tribe reward scroll

Required for completing