A Flogum is a kind of explosive life form native to the inner surface of the rogue planet Zahir: a hollow world whose center houses a sun-like structure orbited by a small moon. These creatures look like hand-sized mineralized shells and grow within the equatorial trench created by the tidal force generated by the moon. They can explode when bumped into, and need to be extracted with great care. The Lemm people are nomads who follow the moon's trajectory in order to harvest the mature Flogums and sell them to the cities of Valsennar and the Malka, who use the Flogums as weapons to war against each other.
- Valérian and Laureline - World Without Stars (1972)