Octarius Sector

The Octarius Sector is the Ultima Segmentum cube of the Octarius War, the Ork empire Overfiend neighbourhood Inquisitor Kryptman fed to Hive Fleet Leviathan on purpose.

Octarius-system, Da Maw, Dakka, Ghorala, and a swarm of greenskin rocks share the chart. The war was supposed to bleed both xenos; it mostly taught them both new tricks.

The Octarius Sector still matters as a warning about using one apocalypse to cancel another. Unofficial maps keep the Ultima parent and leave the Overfiend's well under octarius-system.