Frost dragons are also notable for being among the first monsters that free-to-play players could kill that drop dragon bones, thus these monsters turned dragon bones into a free-to-play item for the first time. However, the dragon bones cannot be taken out of Daemonheim. The three species of dragons (frost, iron and green) found in Daemonheim floors accessible to free-to-play, and are the only dragons apart from Elvarg that free players can fight.