Overview
This marker stands for the Sabbat Worlds theater, a region remembered through crusade logistics, liberation claims, and stubborn resistance. (No canon source ties the world 'Chiros' to the Sabbat Worlds; the earlier anchor name has been dropped.)
It is not a single quiet world but a knot of a hundred systems and more, where maps change as armies move.
The approximate ring marks the way a crusade region is easier to name than to pin down.
M41 and M42 status
Crusade region under contested Imperial reconquest.
Veteran crusade theatre with scattered route uncertainty.
Timeline
Crusade cartographers begin revising Pacificus-frontier holdings.
War-zone summaries report repeated changes in local control.
Veteran formations rotate through contested Sabbat approaches.
Later archives treat the region as a hard-won but unstable reference point.
Cartographic positions and several administrative details are intentionally approximate where published Warhammer sources conflict or provide no canonical coordinate system.