Piety is a vast hive world of 20 billion souls, famed for its unique atmospheric phenomenon known as the Glow, a shimmering aurora that shapes the planet’s festivals, faith, and culture. Each year, the Days of Glow are marked by great processions, fiery devotionals, and mass gatherings that reaffirm the people’s loyalty to the God-Emperor.
Governed by House Antraxis alongside the formidable Suppressor Troops, Piety balances tradition, faith, and industry. Its manufactoria produce dyes, promethium additives, and military recruits in enormous numbers, while its shrine-districts and radiant skies give the world a character unlike any other in the Drusus Marches.
Ignis Aeternus WH 40K campaign notes 