Moraz III, a Death World swathed in carnivorous jungle flora, is struck by the wreckage of a Rogue Trader's menagerie-ship. The Genestealer that broke free from the ship's hold infects the local populace, giving rise to the nascent Cult Veridian.
However, every human and hybrid member of the dynasty is killed when a regiment of Catachan Jungle Fighters uses Moraz III as a training world for their hunt-and-slay tactics. Only the Genestealers escape.
Once the Catachans have left the planet, the xenos emerge once more, swiftly becoming the alpha predator of the jungle and reclaiming Moraz III for themselves before beginning the cycle anew.
- Codex: Genestealer Cults (8th Edition), pg. 36, "Death in the Jungle"