Horus Heresy · atlas

World · Segmentum Obscurus · place disputed

Prospero

Homeworld: XV Thousand Sons

Fig. 1 · Location on the map

Prospero was once a lavish paradise world (the city of Tizca), the home world of the Thousand Sons and Magnus the Red. Turned into a dead world at the Burning of Prospero (c. 004–005.M31) by the strike of the Space Wolves, Custodians and Sisters of Silence. The segmentum is disputed (Ultima by the Lexicanum category vs Obscurus on old maps).

Category
World
Location
Segmentum Obscurus
Significance on the map
4 of 5
Place confidence
Place disputed
Events
3 events

Place on the map

The place is disputed: the canon locates it ambiguously; the point on the map is a cautious estimate.

Grounds for placing the system exactly here on the map:

  • «Segmentum designation is genuinely disputed… place in the NORTH/NORTHEAST (Obscurus-leaning)» — Atlas compilation · source check 2026

Events in the system

Legions

Legion homeworld: XV Thousand Sons — traitors.

Legions named in the system’s events:

Factions

Named among the sides of the system’s events:

Characters

Linked to the system’s events:

Sources

  1. Lexicanum: Prospero System
  2. WH40k Fandom: Prospero
  3. Atlas compilation · source check 2026
Open in the atlas