|Map||Basic Data||Planetary Image|
|Class:||Destroyed, former Adeptus Astartes Homeworld|
A den of hive-sprawls and polluted industry, Cthonia existed in one of Earth's closest neighbouring systems. Being within reach even for non-warp spacecraft, Cthonia had been colonised, built upon, tunneled and mined probably since the dawn of space travel. As such, all natural resources had been stripped away and used up millennia before, and the ancient mining technology had long since been rediscovered and removed by the Adeptus Mechanicus of Mars. The planet that remained was largely redundant and abandoned, completely riddled with catacombs, crumbling industrial plants and exhausted mine-workings. The planet was notorious for the vicious gangs and slums.
The first Imperial contact with Cthonia took place in the early Great Crusade, when a Star Hunters pioneer company under Captain Kornelius Dure discovered the world and declared it a "nest of serpents coiling in the dark that we would be better to destroy". However, the planet was revealed as the homeworld of Horus, one of the Emperor's lost Primarch's and the first to be rediscovered. Upon incorporation into the Imperium, the Space Marines of the Luna Wolves Legion were created using the human inhabitants of the violent gangs inhabiting the planet's Hives.
- 1: Index Astartes IV, [Needs Citation]
- 2: Codex: Space Marines (3rd Edition), [Needs Citation]
- 3: Warlords of the Dark Millennium: Abaddon the Despoiler (Background Book),[Needs Citation]
- 4: The Horus Heresy Book Eight pg.138-139