The OSRS Ethically Acquired Antiques quest is one of the newly added quests to Old School RuneScape, introduced alongside the Varlamore region. This quest is a mix of detective work and action, as you track down a missing diadem and uncover a shady theft involving a well-known curator. In this guide, we will walk you through the steps to complete the quest, providing you with the fastest ways to navigate the investigation, what items you’ll need, and how to handle each stage. Whether you’re after the 6,000 Thieving XP or want to experience an engaging new story, this guide will help you along the way.

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Before You Start

Skill Requirements:

25 Thieving

Quest Requirements:

Children of the Sun

Shield of Arrav

Recommended Items:

3,000 coins for the charter ship (optional)

Ring of Charos (for a reduced charter cost, optional)

Explorer's Ring 2+ (for teleporting, optional)

Varrock Teleport

Civitas illa Fortis Teleport

1 free inventory space

Short Walkthrough

If you're an experienced player, here's a quick guide to help you get through the quest efficiently:

Getting Started:

Travel to the Grand Museum in Civitas illa Fortis.

Inspect the empty display case in the northeast corner.

Speak to Curator Herminius about the case and the missing diadem.

Examine the tools behind the display case and inspect the display case again.

Following the Trail:

Speak with various citizens, academics, and tourists until you find someone who mentions a suspicious character.

Chat with Regulus Cento to get a lead on the suspect.

Go east and talk to Trader Crewmember about the suspicious man.

Visit the crafting shop to get sails repaired by Artima.

Return to Trader Crewmember to discuss the mysterious individual.

Port Sarim Investigation:

Travel to Port Sarim and speak with Trader Stan or the crew at the southern dock.

Talk to Betty in the northwest Port Sarim magic shop.

Read the note Betty gives you.

Confronting the Curator:

Visit Varrock Museum and confront Curator Haig Halen about the diadem.

Pickpocket Haig Halen for the storeroom key.

Search the crates in the north-east storeroom for the diadem.

Return to Haig Halen and use the dialogue options to increase the shame meter.

Speak with Curator Herminius to complete the quest.

Long Walkthrough

Here’s a detailed guide for those who want to fully understand the quest mechanics and enjoy the detective experience:

Museum Heist

Start your adventure by heading to the Grand Museum in Civitas illa Fortis. Once inside, go to the northeast corner where you'll find an empty display case. Inspect it carefully. You'll find that Curator Herminius is already aware of the missing diadem but is reluctant to do much about it. This is where you come in.

Examine the tools behind the display case. These tools suggest that the theft was carefully executed by someone skilled. Inspect the display case again to see signs of tampering, and it becomes clear that you are dealing with a professional thief.

Following the Trail

Next, you'll need to gather information from the locals. Talk to citizens, academics, and tourists around the museum. Eventually, you'll find someone who mentions a suspicious character seen leaving through the main entrance. Keep talking to people until you find the right witness.

Your next lead is Regulus Cento at the landing site. He tells you that the shady figure was carrying a case and seemed oddly interested in his quetzal. When Regulus wouldn't let the person near the bird, the suspect moved eastward to the Fortis Cothon.

Before continuing, ensure you have at least one free inventory space. You'll need it for later.

Sailing to Port Sarim

Go to the Cothon and speak with any Trader Crewmember. They’ll mention the mysterious man and ask you to complete a small errand. The crewmember will give you some tattered sails that need to be repaired. Take these to Artima, who runs a crafting shop just south of the Cothon. She’ll repair them, but first, she wants you to perform a favor for her.

Once you’ve got the sails fixed, return them to the Trader Crewmember. They’ll reveal that the thief was a “grey-haired fella” who needed sailing lessons before heading to Port Sarim.

Travel to Port Sarim via whichever method you prefer (charter ship, Rat Pits teleport, or Spirit Tree), and speak to the Trader Crew at the southernmost dock. They’ll direct you north, where you’ll discover the suspect was after runes.

Uncovering the Truth

Your next stop is Betty’s Magic Emporium in northwest Port Sarim. Betty recalls a monocled man looking for runes but not knowing exactly which ones he needed. She gives you a note detailing the specific runes — turns out they were the Varrock Teleport runes. The mystery suspect is none other than Curator Haig Halen!

The Confrontation

Travel to the Varrock Museum and confront Haig Halen. He’ll act nervous, confirming your suspicions. Pickpocket him for the storeroom key and head to the north-east storeroom. Search through the crates to find Xerna’s Diadem.

Once you’ve found the diadem, return to Haig Halen. A Shame-o-meter will appear. Use the correct dialogue options to make him feel guilty about his actions. Once Haig admits everything, you’ll be able to finish the quest.

Quest Complete!

Return to Civitas illa Fortis and speak with Curator Herminius to complete the quest.

Quest Rewards

1 Quest Point

6,000 Thieving Experience

5,000 Coins

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