Cthonia is the home world of Horus and of the XVI Legion, a polluted hive world in one of the systems nearest Terra; its proximity to Sol made it strategically important. The Siege of Cthonia proceeded in three stages (006–014.M31).
- Category
- World
- Location
- Segmentum Solar
- Significance on the map
- 2 of 5
- Place confidence
- Place reliable
- Events
- 1 event
Place on the map
Grounds for placing the system exactly here on the map:
- «Cthonia existed in one of Terra’s closest neighbouring systems… Segmentum Solar» — Atlas compilation · source check 2026
Events in the system
Legions
Legion homeworld: XVI Sons of Horus — traitors.
Legions named in the system’s events:
Factions
Named among the sides of the system’s events:
Sources
- WH40k Fandom: Cthonia
- Lexicanum: Cthonia
- Atlas compilation · source check 2026
Open in the atlas
Permalink: https://astart.es/en/systems/cthonia/