The Lost Tribe/Quick guide

Lumbridge cellar

 * Talk to Sigmund on the first floor of Lumbridge castle.
 * Talk to the following NPCs about Lumbridge cellar until one of them mentions a goblin:
 * The Duke.
 * The Cook downstairs.
 * Hans in the courtyard.
 * Father Aereck in the Church.
 * Bob in the axe shop.
 * Talk to Sigmund, then the Duke.
 * Descend the trapdoor in the kitchen and mine the wall rubble.
 * Go through the wall and take the brooch.

Dorgeshuun

 * Show the brooch to the Duke.
 * Talk to Reldo in Varrock castle.
 * Search the north-western bookcase for a goblin symbol book.
 * Read the book to the end.
 * Talk to General Bentnoze and General Wartface in Goblin Village, use chat options 1-3-2-3-3.
 * Talk to the Duke.
 * Run through the cave (pictured right).
 * Use the goblin bow emote near Mistag.
 * Follow Mistag.

Making Peace

 * Talk to the Duke.
 * Pickpocket Sigmund.
 * Open the chest in the other room. The robes are required in later quests.
 * Enter the H.A.M. Dungeon, then search the crate near the entrance.
 * Show the Duke the silverware.
 * Go through the Lumbridge cellar and follow Kazgar.
 * Talk to Mistag.
 * Quest complete!