The Crimson Falling
Hive Sibellus is a collection of spire after spire of housing and forges dedicated to supporting the large population of the planet. Without much regard for consequence, structures have been built higher and higher, resulting in a vertical divide of society. The higher classes live well above the squalour of the foundations, and the lowly citizens live their lives in the shadow of the very buildings they built.
The Lucid Palace and the Tricorn Palace are both situated in Hive Sibellus.