A hairball of carbon produced by fire breathing animals
It is inevitable that as a creature that produces flames from their oesophagus, sharing the same tube as normal breathing and eating, that sometimes it will go the wrong way. Even with fireproof mucus everywhere, soot manages to build up in the stomach and has to be ejected by pulling it into a small tight ball of dense charcoal-like substance before being ‘coughed up’ in a violent fit that sometimes induces interesting colours of sparks as other random chemical elements are burned off. The coughing of large creatures are often mistaken for fireworks.
The result is an odd combination of flammable carbon and inflammable Mucus that has hardened and is semi-transparent. Larger ones are sometimes known as dragon balls, and power some of the everlasting flames in temple entrances when there is not an enchanted flame, as they burn slowly, occasionally lasting up to a century.
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