Strange rocks obtained by training Firemaking are part of the Dahmaroc statue. Two Strange rocks from each skill are required to complete the statue, which can be built once per week. Strange rocks may be stored inside a statue collection bag.
Lighting a fire using any logs and a tinderbox, as well as burning vines in Jadinko Lair, burning shades in Mort'ton, adding logs to a bonfire. Making charcoal in the clan citadel. Note: Pyrelord and Forge regent familiars do not count as a tinderbox for this. Also, barbarian firemaking does not yield rocks.