A total of six onyx dragons are located in the gemstone cavern under the Shilo Village mining site. They require the completion of the Hard Karamja Tasks in order to access them in the gem rock cavern underneath. In order to pass the barrier to confront them, players are also required to sacrifice a number of uncut dragonstone, uncut onyx, or uncut hydrix gems - with each gem type allowing the player to kill a certain number of dragons within their respective chamber; up to a limit of storing 60,000 kills at a time.