During the [[Thirteenth Black Crusade]] the Death World found itself in the path of both a wounded [[Void Whale]] and a [[Waaagh!]] led by the [[Freebooter]] Kaptain [[Badrukk]]. However due to interference caused by the [[Warp Storm]] [[Bas Infernia]], the Imperium was unable to warn the Catachans of the threats heading towards them.{{Fn|10}} During the formation of the [[Great Rift]], Catachan was caught within the malignant rift and exposed to [[Daemon]]ic invasion. However when [[Guilliman]]'s [[Indomitus Crusade]] arrived, they found that the local Catachan regiments had already dealt with the threat.{{Fn|11}}

All of the animals and plants on Catachan are geared in some way to destroy humans and any other invaders. Every plant is poisonous, making foraging impossible. Some plants secrete pollen into the air which is poisonous and destroys air-filters. Others secrete sticky liquid to capture passing animals and slowly dissolve them. Other plants poison the ground and turn the immediate area around them into boggy wasteland to trap invaders. In the jungle, even the slightest scratch can prove fatal as necrotic bacteria swarm in to putrefy it. The native animals are as deadly to humanity as the plant life, the [[Catachan Devil]] with jaws as big as a tank is a major threat to human living centres. The giant [[Shambling Mamorph]]s of the volcanic regions are also a considered to be a major threat.{{Fn|1}}{{Fn|15}}{{Fn|18}}

*[[Catachan Bloodfly]]{{Fn|8b}}

*[[Catachan Pusworm]]{{Fn|9}}

==Disease==

*{{Endn|20}}: [[White Dwarf 286 (US)]] pg. 104-106

*{{Endn|21}}: [[Only War Core Rulebook]] pg.44-45

===Uncited===