Dragonfire
This topic might need a dab, and Conundrum presents a book in the Land of Fiction under the title Dragonfire. Care with the disambiguation should be applied, as there is a high chance a source will show the TV story and novelisation existing within the Doctor's universe, seeing as the reappearance of the Doctor Who series in the main universe is becoming ever more frequent.
Talk about it here.
- You may be looking for the television story.
The Dragonfire was the power source for the spacecraft hidden on the surface of Svartos. It was hidden inside a biomechanical creature colloquially known as a "dragon". The Dragonfire was hidden away from Kane, a Proamonian exiled to Svartos, who spent three thousand years within Iceworld searching for the Dragonfire. (TV: Dragonfire)