The Piëzoelectric effect by rubbing a proper stick over the scalpula creates disturbances of charges, which creates corresponding heat by the pyro-electric effect in order to get fire for the bonfire of course.
It isn’t that different than the idea of using organ donors, although it hurts to use the scalpula of the people who are dear to you.
Properly crafted firestones could perhaps work too though. Regular lighters use gaseous fuel of course. I’m not imformed, but crafting materials for the the spark could perhaps only be possible with our modern technology, or maybe not. I learned at scouting to start the fire by using birch bark, but it was by a match. I’m totally straight though, so I guess that my parents and I were clueless.