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

Map Basic Data Planetary Image
px Name: Cthonia Cthonia.jpg
Segmentum: Segmentum Solar
Sector: Unknown
Subsector: Unknown
System: Cthonia system
Population: Unknown
Affiliation: Unknown
Class: Destroyed, former Adeptus Astartes Homeworld
Tithe Grade: N/A


This planet allegedly 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.[1] The planet was notorious for the vicious gangs and slums.[3]

After the arrival of the Emperor, the Space Marines of the Luna Wolves Legion were created using the human inhabitants of the violent gangs inhabiting the planet's Hives.[1]

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

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