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'''Desert worlds''' are desolate planets with no bodies of water and with completely desert terrains. Since "desert world" only refers to the planet's terrain, most human-populated desert worlds fall into a technical [[Class (planet)|Imperial class]], such as [[civilised world]], [[feral world]] or [[death world]]{{Cite ThisMarker End}}. As a result of their harsh environments, the inhabitants of desert worlds are prudent and cautious people. They take care of their precious resources and only strike out at their enemies when the moment is right. They are also excellent guerrilla fighters, as their skills at hiding in featureless deserts make them superlative scouts and deadly ambushers.{{Fn|2}}

Generally, the planets are desert worlds when they are colonised, but in some extreme cases such as [[virus bomb]]ing, a formerly habitable planet had its ecosystem completely destroyed, leading to planetwide desertification. This was the case on [[Tallarn]] after it was bombarded by the [[Iron Warriors]].{{Cite ThisMarker End}}

*{{Endn|1}}: [[Codex: Ultramarines (2nd Edition)]], {{Cite ThisMarker End}}