The Bone brooch was the winning item in the Guaranteed Content poll on the RuneScape website for the 2010 Hallowe'en event. It also appeared as an option in the Guaranteed Content poll of Halloween 2007; however, it lost to the Grim reaper hood. When worn, it does not occupy any equipment slots.
The bone brooch was released to players on 18 October2010, upon the completion of the Halloween event. The reward was chosen by players in a "Guaranteed Content Poll". It allows the player to morph into a pile of bones when worn, although these bones appear different from a real pile. If a player is attacked while wearing it, they will automatically unmorph. As it is an untradeable holiday item, if lost it can be recovered by speaking to Diango.
When playing a game of Great Orb Project, the message will read "You're here to collect orbs, not turn into bones."
While in combat, the message will read "During a battle is rarely the right time for fashion experiments."
When pedaling at the Blast Furnace, the message will read "You don't think you could pedal effectively if you were just bones."
If you attempt to wear the bone brooch while you are stunned from picking pockets, your chatbox will state that you cannot transform while being bound by magic.
When opening the equipment screen, although the Bone brooch is worn-and there is the option to wear it, attempting to do so will result in a message in the chat box saying that the Bone brooch can't be worn. This is because the Bone brooch is never actually worn, clicking on 'wear' simply transforms the player.