A shrine world sanctified by Saint Drusus, a key figure in the history of the Calixis Sector. A lifeless desert world of salt flats and dust storms, Sentinel is defined by a single monumental shrine: a 5 km-high ouslite spire where the eternal flame of Saint Drusus burns. Pilgrims arrive in billions, many undertaking the Pilgrimage of Silence—abandoning all supplies to wander the wastes until death or revelation. Their desiccated remains mark the salt plains like devotional cairns.
Survival outside the singular hive-shrine is near impossible, though a small underclass scavenges near its base. The shrine is administered by a hardline Drusian cult, preaching purity through suffering and endurance.
Ignis Aeternus WH 40K campaign notes 