Siscia

Siscia is a minor Imperial mining world in the Ophidian Sub-sector, a Celedin promethium exporter whose people live in pre-Strife tunnels and rarely see the sky. This pin is the Sisters of Battle comic rock, not a Calixis capital.

A heretic uprising and a missing Inquisition acolyte brought Canoness Veridyan's squadron into those mines. Life expectancy was already a punchline before Chaos made it a plot. Siscia is not Scintilla, not a shrine world, and not a random Obscurus quarry.

Siscia still matters as the named Sisters comic mine. Unofficial summaries keep the ophidian-subsector parent and refuse to promote the pin to a sector capital or to confuse it with other Ophidian rocks.