The Bone key is an item dropped by Necrovarus when he is shown the completed petition form in the Ghosts Ahoy quest. Use the key to enter the room on the top floor of the Ectofuntus. After the quest the key is useless. This key cannot be put on the Steel key ring acquired from completion of One Small Favour.
|10 December 2015
(update | poll)
The examine of this key has been updated from "A key dropped by Necrovarus." to "A key dropped by Necrovarus (Used in the Ghosts Ahoy quest)." so its purpose is better described.