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Cthonia was the world on which Horus landed after being stolen from the grip of the Emperor.[4]

Map Basic Data Planetary Image
px Name: Cthonia Cthonia.jpg
Segmentum: Segmentum Solar[4]
Sector: Unknown
Subsector: Unknown
System: Unknown
Population: Approx. 2 Billion (before destruction)[4]
Affiliation: Unknown
Class: Destroyed, former Adeptus Astartes Homeworld/Feral World[4]
Tithe Grade: N/A


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,[1] described as rocky and volcanic,[5b] completely riddled with catacombs, crumbling industrial plants and exhausted mine-workings.[1] The planet was notorious for the vicious gangs and slums.[3]

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.[4] 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]

Inhabitants of Cthonia had a slightly freckled faces and pale, craggy features.[5a]

The planet was destroyed after the Horus Heresy during the Great Scouring.[2]

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