Intios & Odessa already were aware of most of the information here. After it was chosen by the Strophes for their cover, Trantor made a data-query on it through Imperial channels and shared the following:

Fenksworld is a small Imperial hive world located to galactic coreward in the Josian Reaches sub-sector of the Calixis Sector. It serves as a substation service depot of the Imperial Navy’s Battlefleet Calixis.

Fenksworld’s most notable feature is its Library of Knowing, one of the Calixis Sector’s most comprehensive sources of data outside the Prol System.

The planet’s reputation is as a grimy roughshod place with notoriously independent sector politics, but viewed as lacking the significance of planets like Scintilla or Malfi.

The primary city is Hive Nova Castillia, a vast towering edifice of sky-piercing spires and busy supply depots, noble enclaves, covered hab-stacks and bustling neon-lit entertainment ‘burgs. Although a little ramshackle and dirty, it is not unlike many other hives across the Imperium. Nova Castillia houses much of the planet’s famously mercurial ruling elite and the bulk of the planet’s population.

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Contact with Other Worlds: Stable Warp routes link Fenksworld to Acreage and Zillman’s Domain.

Population: 22 billion

Tithe Grade: Exactus Extremis

Geography: Extremely cold nights, extremely hot days at the polar caps and temperate climate at the equator. Fenksworld possesses four mountainous and rocky continents separated by polluted seas and oceans. On the southern polar continent lies Magnagorsk Hive, at the northern polar cap is Nova Castilla, on the western continent is Volg Hive, the capital city of the world and on the eastern continent likes the ruins of Hive Akelia, which collapsed decades ago. Fenksworld has no moons but there is a major network of orbital docks located in geostationary orbit above Nova Castilla to service the vessels of the Imperial Navy’s Battlefleet Calixis.

Government Type: Imperial Adeptus Terra

Planetary Governor: Josian Reach Sub-Sector Governor Pas Palacius

Adept Presence: Adeptus Terra, Adeptus Administratum, Adeptus Ministorum, Adeptus Astra Telepathica (Astropathic Choir at Nova Castilla), Adeptus Arbites (high Arbitrator to civilian ratio).

Military: Volg Volunteers (local Planetary Defence Forces; medium quality force, based at Volg Hive), numerous Volg Regiments (1-414th; medium/high quality force, based at Volg Hive), Castillian Finest (local Planetary Defence Forces; high quality force, based at Nova Castilla).

Trade: Main source of manpower and labour in the sector’s Josian Reach. Abundant with various underground factories and refineries dedicated to everything from ore processing to water purifying.