- This sidequest requires The Keyring Mod.
Head to Lord British's castle in Britain and talk to the sage standing beside the drawbridge. He introduces himself as Zauriel, and goes on to explain how he has been waiting for you to arrive and help him rescue his daughter Laurianna.
Agree, and he will explain that in order to neutralise the effects of the necklace you need a chunk of Blackrock. To make the potion you need a second chunk of Blackrock as well as a vial of Silver Serpent venom. You can acquire the Blackrock from Rudyom in Cove, or from the Britannian Mining Company's mines in Minoc. You can acquire the Venom from Minoc, or from other places if you nose around.
Once you have the ingredients, return to Zauriel and choose Make potion. He will then teleport your party to his lab, make the potion, and tell you where his daughter is being held. She is held in the northwestern corner of an island north of Skara Brae. After this revelation he will teleport you back. He informs you that Britain is too crowded for him, so he relocates to 45S 38W, not far from where his daughter is being held.
As Zauriel mentioned in passing, this potion is yet another way to kill Lord British. You can also try it on Batlin if you wish. Remember to save ahead of time in both cases, as you can't get a replacement.
You'll find the island at around 3S 69W. After exploring for a bit you'll find no obvious signs of anything unusual; one of your party members suggests talking to Zauriel about it. Head to 45S 38W and explain it to him.
After a bit he will decide a Gem of Dispelling is the solution. The next problem is that he doesn't have any on him. You have two options now: you can collect the ingredients, which takes a fair bit of time but isn't too hard, or else just search Joneleth's house and see if you can find any intact and unpilfered gems.
Collect the ingredients
- a gem (go to the jeweller in Britain and buy one)
- invisibility dust (???)
- six bee stingers (go to the cave northwest of Yew for these)
- two giant spider eggs (SW of the bee cave)
Overall, the only difficult thing to acquire is the invisibility dust.
Search Joneleth's house
Joneleth's house is on the southeastern chunk of land that encloses Buccaneer's Den.
Once you reach the house you find Joneleth is still alive, in a way. You will have to fight him in order to get the gems (or else leave and collect the ingredients instead). He will have around one to three of the gems on him, and their quality is randomly assigned (only Zauriel can assess their quality).
Return to Zauriel with the gems. Depending on the quality you may end up needing some or all of the ingredients to restore it (bee stingers being the most common). Saving before talking to him and then reloading will change the requirements. The easiest to do would probably be the two bee stingers.