Warp-isolated and neglected, Fervious is a feudal world where all dwell within a single vast shanty-city built atop forgotten ruins. Society has collapsed into cult-dominated fiefdoms where ritual murder secures wealth and status, and warlords, prophet-princes, and death cults hold sway.
The world is infamous for its native Fervious serpents, whose venom coats weapons and caltrops, and the styger, a beast of burden whose milk both nourishes and neutralizes poison—its only valuable export. Weapons like long-sabres, chain-sticks, and hide-forged banded armor define its tribal warfare.
Without centralized rule, Fervious survives as a cursed, decaying world—trading poison, weapons, and styger milk.
Ignis Aeternus WH 40K campaign notes 