Dämonfeuer

Dämonfeuer ('alternate spelling Daemonfeuer; pl. Dämonfeuer; DAY-mon-foy-ər (Grimm: DAY-muhn-fyoo-ər); Germ. Dämon "demon" + Feuer "fire") is dragon like-creature able to breath fire.

Dämonfeuer are treasure-mongers and are very possessive of the large amounts of copper they're known to collect.

Fire production
The diet of Dämonfeuer consists mainly of humans. This fat-rich but low-carb diet induces higher levels of gastric acid production, crucial for digestion within the stomach.

The production of too much gastric acid results in frequent heartburn. If the gastric acids spill into the lungs, this induces coughing, which is the body's way of ridding the lungs of the acids that settle in them.

Dämonfeuer take heartburn to a whole new level with their unique ability to convert fat through ketosis into a highly flammable acetone vapor.