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Experience received from a task as a reward is multiplied by your xp rate
1. Talk to Sigmund on 1st floor (For American players this would be the 2nd floor). Ask him if he has any quests for you. He will tell you of recent damage to the castle cellar. While the Duke insists it is from an earthquake Sigmund says he believes it is the work of “some kind of monsters”. He asks you to talk with other people around town to find out if they saw anything.
2. Talk to the Cook (one floor down) and then go back to Duke Horacio.
3. Go to basement (trap door just north of where the cook stands in the kitchen) and use pickaxe on the wall, then pick Brooch from floor, then go back to the Duke Horacio and show him the brooch.
(don't forget to bring a light source such as a lit candle, or an oil or bulls-eye lantern before going through the wall!)
4. You will be asked to show it to Reldo in the Varrock Palace library.
5. After talk search the bookcase for goblin symbol book, read it.
6. Head to Goblin Village (using a Falador Teleport) and talk to the Generals. Select the “It doesn't really matter” option to get the information you need. (You will receive both goblin emotes)
7. Go back to Lumbridge, and talk to the Duke Horacio. He will tell you to investigate the caves further. Go back into the tunnel (Basement). See the map below for the correct path.
8. Talk to Mistag, and do your Goblin Bow Emote in front of him. After talk right click the Mistag and click follow option. You will back to Lumbridge then talk with Duke Horacio again.
9. Pickpocket Sigmund for key which we will need.
10. Go next-to room and open chest to claim H.A.M robes:
11. Go to H.A.M cave (behind the castle), open trapdoor and climb-down:
12. In front of cave you will see crate, search it to receive silverware:
13. Return to Duka Horacio then go to the basement and enter the tunnel again. This time (rather than threading your way through the maze) you can take a shortcut by right-clicking and choosing to follow Kazgar who will appear near the spot where you found the brooch. Once there, talk to Mistag and a cut-scene will appear leading to the end of the quest and the reward.