A volcanic death world turned forge, Opus Macharius is a bastion of the Adeptus Mechanicus, bound into the Lathe Treaty Network and ruled by Fabricator-General Korvex Tholl. Its atmosphere is ash-choked and lethal, its surface dominated by sealed foundry-hives, orbital forges, and the colossal Ascension Spire, a world-spanning gravity lift that feeds its industry into space.
The planet is famed as the home of Legio Venator, the “Hunting Gods,” whose Titans are birthed and sanctified within the Omnisanct Bastion, a forge-cathedral carved into Mount Dreadwake.
Opus Macharius provides Titans, plasma cores, rare alloys, and war-ordnance across the Calixis Sector, serving as both forge and fortress.
Ignis Aeternus WH 40K campaign notes 